text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  // NOTE: No header guards are used, since this file is intended to be expanded
  // directly into net_log.h. DO NOT include this file anywhere else.
  
  // In the event of a failure, a many end events will have a |net_error|
  // parameter with the integer error code associated with the failure.  Most
  // of these parameters are not individually documented.
  
  // --------------------------------------------------------------------------
  // General pseudo-events
  // --------------------------------------------------------------------------
  
  // Something got cancelled (we determine what is cancelled based on the
  // log context around it.)
  EVENT_TYPE(CANCELLED)
  
  // Something failed (we determine what failed based on the log context
  // around it.)
  // The event has the following parameters:
  //
  //   {
  //     "net_error": <The net error code integer for the failure>,
  //   }
  EVENT_TYPE(FAILED)
  
  // Marks the creation/destruction of a request (net::URLRequest or
  // SocketStream).
  EVENT_TYPE(REQUEST_ALIVE)
  
  // ------------------------------------------------------------------------
  // HostResolverImpl
  // ------------------------------------------------------------------------
  
  // The start/end of waiting on a host resolve (DNS) request.
  // The BEGIN phase contains the following parameters:
  //
  //   {
  //     "source_dependency": <Source id of the request being waited on>,
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL)
  
  // The start/end of a host resolve (DNS) request.  Note that these events are
  // logged for all DNS requests, though not all requests result in the creation
  // of a HostResolvedImpl::Request object.
  //
  // The BEGIN phase contains the following parameters:
  //
  //   {
  //     "host": <Hostname associated with the request>,
  //     "address_family": <The address family to restrict results to>
  //     "allow_cached_response": <Whether it is ok to return a result from
  //                               the host cache>
  //     "is_speculative": <Whether this request was started by the DNS
  //                        prefetcher>
  //     "source_dependency": <Source id, if any, of what created the request>,
  //   }
  //
  // If an error occurred, the END phase will contain these parameters:
  //   {
  //     "net_error": <The net error code integer for the failure>,
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL_REQUEST)
  
  // This event is logged when IPv6 support is determined via IPv6 connect probe.
  EVENT_TYPE(HOST_RESOLVER_IMPL_IPV6_SUPPORTED)
  
  // This event is logged when a request is handled by a cache entry.
  EVENT_TYPE(HOST_RESOLVER_IMPL_CACHE_HIT)
  
  // This event is logged when a request is handled by a HOSTS entry.
  EVENT_TYPE(HOST_RESOLVER_IMPL_HOSTS_HIT)
  
  // This event is created when a new HostResolverImpl::Job is about to be created
  // for a request.
  EVENT_TYPE(HOST_RESOLVER_IMPL_CREATE_JOB)
  
  // The creation/completion of a HostResolverImpl::Job which is created for
  // Requests that cannot be resolved synchronously.
  //
  // The BEGIN phase contains the following parameters:
  //
  //   {
  //     "host": <Hostname associated with the request>,
  //     "source_dependency": <Source id, if any, of what created the request>,
  //   }
  //
  // On success, the END phase has these parameters:
  //   {
  //     "address_list": <The host name being resolved>,
  //   }
  // If an error occurred, the END phase will contain these parameters:
  //   {
  //     "net_error": <The net error code integer for the failure>,
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL_JOB)
  
  // This event is created when a HostResolverImpl::Job is evicted from
  // PriorityDispatch before it can start, because the limit on number of queued
  // Jobs was reached.
  EVENT_TYPE(HOST_RESOLVER_IMPL_JOB_EVICTED)
  
  // This event is created when a HostResolverImpl::Job is started by
  // PriorityDispatch.
  EVENT_TYPE(HOST_RESOLVER_IMPL_JOB_STARTED)
  
  // This event is created when HostResolverImpl::ProcJob is about to start a new
  // attempt to resolve the host.
  //
  // The ATTEMPT_STARTED event has the parameters:
  //
  //   {
  //     "attempt_number": <the number of the attempt that is resolving the host>,
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL_ATTEMPT_STARTED)
  
  // This event is created when HostResolverImpl::ProcJob has finished resolving
  // the host.
  //
  // The ATTEMPT_FINISHED event has the parameters:
  //
  //   {
  //     "attempt_number": <the number of the attempt that has resolved the host>,
  //   }
  // If an error occurred, the END phase will contain these additional parameters:
  //   {
  //     "net_error": <The net error code integer for the failure>,
  //     "os_error": <The exact error code integer that getaddrinfo() returned>,
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL_ATTEMPT_FINISHED)
  
  // This is logged for a request when it's attached to a
  // HostResolverImpl::Job. When this occurs without a preceding
  // HOST_RESOLVER_IMPL_CREATE_JOB entry, it means the request was attached to an
  // existing HostResolverImpl::Job.
  //
  // The event contains the following parameters:
  //
  //   {
  //     "source_dependency": <Source identifier for the attached Job>,
  //   }
  //
  EVENT_TYPE(HOST_RESOLVER_IMPL_JOB_ATTACH)
  
  // This event is logged for the job to which the request is attached.
  // In that case, the event contains the following parameters:
  //
  //   {
  //     "source_dependency": <Source identifier for the attached Request>,
  //     "priority": <New priority of the job>,
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL_JOB_REQUEST_ATTACH)
  
  // This is logged for a job when a request is cancelled and detached.
  //
  // The event contains the following parameters:
  //
  //   {
  //     "source_dependency": <Source identifier for the detached Request>,
  //     "priority": <New priority of the job>,
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL_JOB_REQUEST_DETACH)
  
  // The creation/completion of a HostResolverImpl::ProcTask to call getaddrinfo.
  // The BEGIN phase contains the following parameters:
  //
  //   {
  //     "hostname": <Hostname associated with the request>,
  //   }
  //
  // On success, the END phase has these parameters:
  //   {
  //     "address_list": <The resolved addresses>,
  //   }
  // If an error occurred, the END phase will contain these parameters:
  //   {
  //     "net_error": <The net error code integer for the failure>,
  //     "os_error": <The exact error code integer that getaddrinfo() returned>,
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL_PROC_TASK)
  
  // The creation/completion of a HostResolverImpl::DnsTask to manage a
  // DnsTransaction. The BEGIN phase contains the following parameters:
  //
  //   {
  //     "source_dependency": <Source id of DnsTransaction>,
  //   }
  //
  // On success, the END phase has these parameters:
  //   {
  //     "address_list": <The resolved addresses>,
  //   }
  // If an error occurred, the END phase will contain these parameters:
  //   {
  //     "net_error": <The net error code integer for the failure>,
  //     "dns_error": <The detailed DnsResponse::Result>
  //   }
  EVENT_TYPE(HOST_RESOLVER_IMPL_DNS_TASK)
  
  // ------------------------------------------------------------------------
  // InitProxyResolver
  // ------------------------------------------------------------------------
  
  // The start/end of auto-detect + custom PAC URL configuration.
  EVENT_TYPE(PROXY_SCRIPT_DECIDER)
  
  // The start/end of when proxy autoconfig was artificially paused following
  // a network change event. (We wait some amount of time after being told of
  // network changes to avoid hitting spurious errors during auto-detect).
  EVENT_TYPE(PROXY_SCRIPT_DECIDER_WAIT)
  
  // The start/end of download of a PAC script. This could be the well-known
  // WPAD URL (if testing auto-detect), or a custom PAC URL.
  //
  // The START event has the parameters:
  //   {
  //     "source": <String describing where PAC script comes from>,
  //   }
  //
  // If the fetch failed, then the END phase has these parameters:
  //   {
  //      "net_error": <Net error code integer>,
  //   }
  EVENT_TYPE(PROXY_SCRIPT_DECIDER_FETCH_PAC_SCRIPT)
  
  // This event means that initialization failed because there was no
  // configured script fetcher. (This indicates a configuration error).
  EVENT_TYPE(PROXY_SCRIPT_DECIDER_HAS_NO_FETCHER)
  
  // This event is emitted after deciding to fall-back to the next source
  // of PAC scripts in the list.
  EVENT_TYPE(PROXY_SCRIPT_DECIDER_FALLING_BACK_TO_NEXT_PAC_SOURCE)
  
  // ------------------------------------------------------------------------
  // ProxyService
  // ------------------------------------------------------------------------
  
  // The start/end of a proxy resolve request.
  EVENT_TYPE(PROXY_SERVICE)
  
  // The time while a request is waiting on InitProxyResolver to configure
  // against either WPAD or custom PAC URL. The specifics on this time
  // are found from ProxyService::init_proxy_resolver_log().
  EVENT_TYPE(PROXY_SERVICE_WAITING_FOR_INIT_PAC)
  
  // This event is emitted to show what the PAC script returned. It can contain
  // extra parameters that are either:
  //   {
  //      "pac_string": <List of valid proxy servers, in PAC format>,
  //   }
  //
  //  Or if the the resolver failed:
  //   {
  //      "net_error": <Net error code that resolver failed with>,
  //   }
  EVENT_TYPE(PROXY_SERVICE_RESOLVED_PROXY_LIST)
  
  // This event is emitted whenever the proxy settings used by ProxyService
  // change.
  //
  // It contains these parameters:
  //  {
  //     "old_config": <Dump of the previous proxy settings>,
  //     "new_config": <Dump of the new proxy settings>,
  //  }
  //
  // Note that the "old_config" key will be omitted on the first fetch of the
  // proxy settings (since there wasn't a previous value).
  EVENT_TYPE(PROXY_CONFIG_CHANGED)
  
  // Emitted when a list of bad proxies is reported to the proxy service.
  //
  // Parameters:
  //   {
  //     "bad_proxy_list": <List of bad proxies>,
  //   }
  EVENT_TYPE(BAD_PROXY_LIST_REPORTED)
  
  // ------------------------------------------------------------------------
  // ProxyList
  // ------------------------------------------------------------------------
  
  // Emitted when the first proxy server in a list is being marked as
  // bad and proxy resolution is going to failover to the next one in
  // the list.  The fallback is local to the request.
  //
  // Parameters:
  //   {
  //     "bad_proxy": <URI representation of the failed proxy server>,
  //   }
  EVENT_TYPE(PROXY_LIST_FALLBACK)
  
  // ------------------------------------------------------------------------
  // ProxyResolverV8Tracing
  // ------------------------------------------------------------------------
  
  // This event is emitted when a javascript error has been triggered by a
  // PAC script. It contains the following event parameters:
  //   {
  //      "line_number": <The line number in the PAC script
  //                      (or -1 if not applicable)>,
  //      "message": <The error message>,
  //   }
  EVENT_TYPE(PAC_JAVASCRIPT_ERROR)
  
  // This event is emitted when a PAC script called alert(). It contains the
  // following event parameters:
  //   {
  //      "message": <The string of the alert>,
  //   }
  EVENT_TYPE(PAC_JAVASCRIPT_ALERT)
  
  // ------------------------------------------------------------------------
  // MultiThreadedProxyResolver
  // ------------------------------------------------------------------------
  
  // Measures the time that a proxy resolve request was stalled waiting for a
  // proxy resolver thread to free-up.
  EVENT_TYPE(WAITING_FOR_PROXY_RESOLVER_THREAD)
  
  // This event is emitted just before a PAC request is bound to a thread. It
  // contains these parameters:
  //
  //   {
  //     "thread_number": <Identifier for the PAC thread that is going to
  //                       run this request>,
  //   }
  EVENT_TYPE(SUBMITTED_TO_RESOLVER_THREAD)
  
  // ------------------------------------------------------------------------
  // Socket (Shared by stream and datagram sockets)
  // ------------------------------------------------------------------------
  
  // Marks the begin/end of a socket (TCP/SOCKS/SSL/UDP/"SpdyProxyClientSocket").
  //
  // The BEGIN phase contains the following parameters:
  //
  //   {
  //     "source_dependency": <Source identifier for the controlling entity>,
  //   }
  EVENT_TYPE(SOCKET_ALIVE)
  
  // ------------------------------------------------------------------------
  // StreamSocket
  // ------------------------------------------------------------------------
  
  // The start/end of a TCP connect(). This corresponds with a call to
  // TCPClientSocket::Connect().
  //
  // The START event contains these parameters:
  //
  //   {
  //     "address_list": <List of network address strings>,
  //   }
  //
  // And the END event will contain the following parameters:
  //
  //   {
  //     "net_error": <Net integer error code, on error>,
  //     "source_address": <Local source address of the connection, on success>,
  //   }
  EVENT_TYPE(TCP_CONNECT)
  
  // Nested within TCP_CONNECT, there may be multiple attempts to connect
  // to the individual addresses. The START event will describe the
  // address the attempt is for:
  //
  //   {
  //     "address": <String of the network address>,
  //   }
  //
  // And the END event will contain the system error code if it failed:
  //
  //   {
  //     "os_error": <Integer error code the operating system returned>,
  //   }
  EVENT_TYPE(TCP_CONNECT_ATTEMPT)
  
  // The start/end of a TCP accept(). This corresponds with a call to
  // TCPServerSocket::Accept().
  //
  // The END event will contain the following parameters on success:
  //   {
  //     "address": <Remote address of the accepted connection>,
  //   }
  // On failure it contains the following parameters
  //   {
  //     "net_error": <Net integer error code>,
  //   }
  EVENT_TYPE(TCP_ACCEPT)
  
  // This event is logged to the socket stream whenever the socket is
  // acquired/released via a ClientSocketHandle.
  //
  // The BEGIN phase contains the following parameters:
  //
  //   {
  //     "source_dependency": <Source identifier for the controlling entity>,
  //   }
  EVENT_TYPE(SOCKET_IN_USE)
  
  // The start/end of a SOCKS connect().
  EVENT_TYPE(SOCKS_CONNECT)
  
  // The start/end of a SOCKS5 connect().
  EVENT_TYPE(SOCKS5_CONNECT)
  
  // This event is emitted when the SOCKS connect fails because the provided
  // was longer than 255 characters.
  EVENT_TYPE(SOCKS_HOSTNAME_TOO_BIG)
  
  // These events are emitted when insufficient data was read while
  // trying to establish a connection to the SOCKS proxy server
  // (during the greeting phase or handshake phase, respectively).
  EVENT_TYPE(SOCKS_UNEXPECTEDLY_CLOSED_DURING_GREETING)
  EVENT_TYPE(SOCKS_UNEXPECTEDLY_CLOSED_DURING_HANDSHAKE)
  
  // This event indicates that a bad version number was received in the
  // proxy server's response. The extra parameters show its value:
  //   {
  //     "version": <Integer version number in the response>,
  //   }
  EVENT_TYPE(SOCKS_UNEXPECTED_VERSION)
  
  // This event indicates that the SOCKS proxy server returned an error while
  // trying to create a connection. The following parameters will be attached
  // to the event:
  //   {
  //     "error_code": <Integer error code returned by the server>,
  //   }
  EVENT_TYPE(SOCKS_SERVER_ERROR)
  
  // This event indicates that the SOCKS proxy server asked for an authentication
  // method that we don't support. The following parameters are attached to the
  // event:
  //   {
  //     "method": <Integer method code>,
  //   }
  EVENT_TYPE(SOCKS_UNEXPECTED_AUTH)
  
  // This event indicates that the SOCKS proxy server's response indicated an
  // address type which we are not prepared to handle.
  // The following parameters are attached to the event:
  //   {
  //     "address_type": <Integer code for the address type>,
  //   }
  EVENT_TYPE(SOCKS_UNKNOWN_ADDRESS_TYPE)
  
  // The start/end of an SSL "connect" (aka client handshake).
  EVENT_TYPE(SSL_CONNECT)
  
  // The start/end of an SSL server handshake (aka "accept").
  EVENT_TYPE(SSL_SERVER_HANDSHAKE)
  
  // The SSL server requested a client certificate.
  EVENT_TYPE(SSL_CLIENT_CERT_REQUESTED)
  
  // The start/end of getting a domain-bound certificate and private key.
  //
  // The END event will contain the following parameters on failure:
  //
  //   {
  //     "net_error": <Net integer error code>,
  //   }
  EVENT_TYPE(SSL_GET_DOMAIN_BOUND_CERT)
  
  // The SSL server requested a channel id.
  EVENT_TYPE(SSL_CHANNEL_ID_REQUESTED)
  
  // A channel ID was provided to the SSL library to be sent to the SSL server.
  EVENT_TYPE(SSL_CHANNEL_ID_PROVIDED)
  
  // A client certificate (or none) was provided to the SSL library to be sent
  // to the SSL server.
  // The following parameters are attached to the event:
  //   {
  //     "cert_count": <Number of certificates>,
  //   }
  //   A cert_count of 0 means no client certificate was provided.
  //   A cert_count of -1 means a client certificate was provided but we don't
  //   know the size of the certificate chain.
  EVENT_TYPE(SSL_CLIENT_CERT_PROVIDED)
  
  // An SSL error occurred while trying to do the indicated activity.
  // The following parameters are attached to the event:
  //   {
  //     "net_error": <Integer code for the specific error type>,
  //     "ssl_lib_error": <SSL library's integer code for the specific error type>
  //   }
  EVENT_TYPE(SSL_HANDSHAKE_ERROR)
  EVENT_TYPE(SSL_READ_ERROR)
  EVENT_TYPE(SSL_WRITE_ERROR)
  
  // An SSL connection needs to be retried with a lower protocol version because
  // the server may be intolerant of the protocol version we offered.
  // The following parameters are attached to the event:
  //   {
  //     "host_and_port": <String encoding the host and port>,
  //     "net_error": <Net integer error code>,
  //     "version_before": <SSL version before the fallback>,
  //     "version_after": <SSL version after the fallback>,
  //   }
  EVENT_TYPE(SSL_VERSION_FALLBACK)
  
  // We found that our prediction of the server's certificates was correct and
  // we merged the verification with the SSLHostInfo. (Note: now obsolete.)
  EVENT_TYPE(SSL_VERIFICATION_MERGED)
  
  // An SSL error occurred while calling an NSS function not directly related to
  // one of the above activities.  Can also be used when more information than
  // is provided by just an error code is needed:
  //   {
  //     "function": <Name of the NSS function, as a string>,
  //     "param": <Most relevant parameter, if any>,
  //     "ssl_lib_error": <NSS library's integer code for the specific error type>
  //   }
  EVENT_TYPE(SSL_NSS_ERROR)
  
  // The specified number of bytes were sent on the socket.  Depending on the
  // source of the event, may be logged either once the data is sent, or when it
  // is queued to be sent.
  // The following parameters are attached:
  //   {
  //     "byte_count": <Number of bytes that were just sent>,
  //     "hex_encoded_bytes": <The exact bytes sent, as a hexadecimal string.
  //                           Only present when byte logging is enabled>,
  //   }
  EVENT_TYPE(SOCKET_BYTES_SENT)
  EVENT_TYPE(SSL_SOCKET_BYTES_SENT)
  
  // The specified number of bytes were received on the socket.
  // The following parameters are attached:
  //   {
  //     "byte_count": <Number of bytes that were just received>,
  //     "hex_encoded_bytes": <The exact bytes received, as a hexadecimal string.
  //                           Only present when byte logging is enabled>,
  //   }
  EVENT_TYPE(SOCKET_BYTES_RECEIVED)
  EVENT_TYPE(SSL_SOCKET_BYTES_RECEIVED)
  
  // A socket error occurred while trying to do the indicated activity.
  // The following parameters are attached to the event:
  //   {
  //     "net_error": <Integer code for the specific error type>,
  //     "os_error": <Integer error code the operating system returned>
  //   }
  EVENT_TYPE(SOCKET_READ_ERROR)
  EVENT_TYPE(SOCKET_WRITE_ERROR)
  
  // The socket was closed locally (The socket may or may not have been closed
  // by the remote side already)
  EVENT_TYPE(SOCKET_CLOSED)
  
  // Certificates were received from the SSL server (during a handshake or
  // renegotiation). This event is only present when logging at LOG_ALL.
  // The following parameters are attached to the event:
  //  {
  //    "certificates": <A list of PEM encoded certificates in the order that
  //                     they were sent by the server>,
  //  }
  EVENT_TYPE(SSL_CERTIFICATES_RECEIVED)
  
  // Signed Certificate Timestamps were received from the server.
  // The following parameters are attached to the event:
  // {
  //    "embedded_scts": Base64-encoded SignedCertificateTimestampList,
  //    "scts_from_ocsp_response": Base64-encoded SignedCertificateTimestampList,
  //    "scts_from_tls_extension": Base64-encoded SignedCertificateTimestampList,
  // }
  //
  // The SignedCertificateTimestampList is defined in RFC6962 and is exactly as
  // received from the server.
  EVENT_TYPE(SIGNED_CERTIFICATE_TIMESTAMPS_RECEIVED)
  
  // Signed Certificate Timestamps were checked.
  // The following parameters are attached to the event:
  // {
  //    "verified_scts": <A list of SCTs>,
  //    "invalid_scts": <A list of SCTs>,
  //    "scts_from_unknown_logs": <A list of SCTs>,
  // }
  //
  // Where each SCT is an object:
  // {
  //    "origin": <one of: "embedded_in_certificate", "tls_extension", "ocsp">,
  //    "version": <numeric version>,
  //    "log_id": <base64-encoded log id>,
  //    "timestamp": <numeric timestamp in milliseconds since the Unix epoch>,
  //    "hash_algorithm": <name of the hash algorithm>,
  //    "signature_algorithm": <name of the signature algorithm>,
  //    "signature_data": <base64-encoded signature bytes>,
  // }
  EVENT_TYPE(SIGNED_CERTIFICATE_TIMESTAMPS_CHECKED)
  
  // ------------------------------------------------------------------------
  // DatagramSocket
  // ------------------------------------------------------------------------
  
  // The start/end of a UDP client connecting.
  //
  // The START event contains these parameters:
  //
  //   {
  //     "address": <Remote address being connected to>,
  //   }
  //
  // And the END event will contain the following parameter:
  //
  //   {
  //     "net_error": <Net integer error code, on failure>,
  //   }
  EVENT_TYPE(UDP_CONNECT)
  
  // The local address of the UDP socket, retrieved via getsockname.
  // The following parameters are attached:
  //   {
  //     "address": <Local address bound to the socket>,
  //   }
  EVENT_TYPE(UDP_LOCAL_ADDRESS)
  
  // The specified number of bytes were transferred on the socket.
  // The following parameters are attached:
  //   {
  //     "address": <Remote address of data transfer.  Not present when not
  //                 specified for UDP_BYTES_SENT events>,
  //     "byte_count": <Number of bytes that were just received>,
  //     "hex_encoded_bytes": <The exact bytes received, as a hexadecimal string.
  //                           Only present when byte logging is enabled>,
  //   }
  EVENT_TYPE(UDP_BYTES_RECEIVED)
  EVENT_TYPE(UDP_BYTES_SENT)
  
  // Logged when an error occurs while reading or writing to/from a UDP socket.
  // The following parameters are attached:
  //   {
  //     "net_error": <Net error code>,
  //   }
  EVENT_TYPE(UDP_RECEIVE_ERROR)
  EVENT_TYPE(UDP_SEND_ERROR)
  
  // ------------------------------------------------------------------------
  // ClientSocketPoolBase::ConnectJob
  // ------------------------------------------------------------------------
  
  // The start/end of a ConnectJob.
  //
  // The BEGIN phase has these parameters:
  //
  //   {
  //     "group_name": <The group name for the socket request.>,
  //   }
  EVENT_TYPE(SOCKET_POOL_CONNECT_JOB)
  
  // The start/end of the ConnectJob::Connect().
  EVENT_TYPE(SOCKET_POOL_CONNECT_JOB_CONNECT)
  
  // This event is logged whenever the ConnectJob gets a new socket
  // association. The event parameters point to that socket:
  //
  //   {
  //     "source_dependency": <The source identifier for the new socket.>,
  //   }
  EVENT_TYPE(CONNECT_JOB_SET_SOCKET)
  
  // Whether the connect job timed out.
  EVENT_TYPE(SOCKET_POOL_CONNECT_JOB_TIMED_OUT)
  
  // ------------------------------------------------------------------------
  // ClientSocketPoolBaseHelper
  // ------------------------------------------------------------------------
  
  // The start/end of a client socket pool request for a socket.
  EVENT_TYPE(SOCKET_POOL)
  
  // The request stalled because there are too many sockets in the pool.
  EVENT_TYPE(SOCKET_POOL_STALLED_MAX_SOCKETS)
  
  // The request stalled because there are too many sockets in the group.
  EVENT_TYPE(SOCKET_POOL_STALLED_MAX_SOCKETS_PER_GROUP)
  
  // Indicates that we reused an existing socket. Attached to the event are
  // the parameters:
  //   {
  //     "idle_ms": <The number of milliseconds the socket was sitting idle for>,
  //   }
  EVENT_TYPE(SOCKET_POOL_REUSED_AN_EXISTING_SOCKET)
  
  // This event simply describes the host:port that were requested from the
  // socket pool. Its parameters are:
  //   {
  //     "host_and_port": <String encoding the host and port>,
  //   }
  EVENT_TYPE(TCP_CLIENT_SOCKET_POOL_REQUESTED_SOCKET)
  
  // This event simply describes the host:port that were requested from the
  // socket pool. Its parameters are:
  //   {
  //     "host_and_port": <String encoding the host and port>,
  //   }
  EVENT_TYPE(TCP_CLIENT_SOCKET_POOL_REQUESTED_SOCKETS)
  
  
  // A backup connect job is created due to slow connect.
  EVENT_TYPE(BACKUP_CONNECT_JOB_CREATED)
  
  // This event is sent when a connect job is eventually bound to a request
  // (because of late binding and socket backup jobs, we don't assign the job to
  // a request until it has completed).
  //
  // The event parameters are:
  //   {
  //      "source_dependency": <Source identifer for the connect job we are
  //                            bound to>,
  //   }
  EVENT_TYPE(SOCKET_POOL_BOUND_TO_CONNECT_JOB)
  
  // Identifies the NetLog::Source() for the Socket assigned to the pending
  // request. The event parameters are:
  //   {
  //      "source_dependency": <Source identifier for the socket we acquired>,
  //   }
  EVENT_TYPE(SOCKET_POOL_BOUND_TO_SOCKET)
  
  // The start/end of a client socket pool request for multiple sockets.
  // The event parameters are:
  //   {
  //      "num_sockets": <Number of sockets we're trying to ensure are connected>,
  //   }
  EVENT_TYPE(SOCKET_POOL_CONNECTING_N_SOCKETS)
  
  // ------------------------------------------------------------------------
  // URLRequest
  // ------------------------------------------------------------------------
  
  // Measures the time it took a net::URLRequestJob to start. For the most part
  // this corresponds with the time between net::URLRequest::Start() and
  // net::URLRequest::ResponseStarted(), however it is also repeated for every
  // redirect, and every intercepted job that handles the request.
  //
  // For the BEGIN phase, the following parameters are attached:
  //   {
  //      "url": <String of URL being loaded>,
  //      "method": <The method ("POST" or "GET" or "HEAD" etc..)>,
  //      "load_flags": <Numeric value of the combined load flags>,
  //      "priority": <Numeric priority of the request>,
  //      "upload_id" <String of upload body identifier, if present>,
  //   }
  //
  // For the END phase, if there was an error, the following parameters are
  // attached:
  //   {
  //      "net_error": <Net error code of the failure>,
  //   }
  EVENT_TYPE(URL_REQUEST_START_JOB)
  
  // This event is sent once a net::URLRequest receives a redirect. The parameters
  // attached to the event are:
  //   {
  //     "location": <The URL that was redirected to>,
  //   }
  EVENT_TYPE(URL_REQUEST_REDIRECTED)
  
  // Measures the time between when a net::URLRequest calls a delegate that can
  // block it, and when the delegate allows the request to resume.
  EVENT_TYPE(URL_REQUEST_DELEGATE)
  
  // Logged when a delegate informs the URL_REQUEST of what's currently blocking
  // the request. The parameters attached to the begin event are:
  //   {
  //     "delegate_info": <Information about what's blocking the request>,
  //   }
  EVENT_TYPE(DELEGATE_INFO)
  
  // The specified number of bytes were read from the net::URLRequest.
  // The filtered event is used when the bytes were passed through a filter before
  // being read.  This event is only present when byte logging is enabled.
  // The following parameters are attached:
  //   {
  //     "byte_count": <Number of bytes that were just sent>,
  //     "hex_encoded_bytes": <The exact bytes sent, as a hexadecimal string>,
  //   }
  EVENT_TYPE(URL_REQUEST_JOB_BYTES_READ)
  EVENT_TYPE(URL_REQUEST_JOB_FILTERED_BYTES_READ)
  
  // This event is sent when the priority of a net::URLRequest is
  // changed after it has started. The following parameters are attached:
  //   {
  //     "priority": <Numerical value of the priority (higher is more important)>,
  //   }
  EVENT_TYPE(URL_REQUEST_SET_PRIORITY)
  
  EVENT_TYPE(URL_REQUEST_REDIRECT_JOB)
  // This event is logged when a URLRequestRedirectJob is started for a request.
  // The following parameters are attached:
  //   {
  //     "reason": <Reason for the redirect, as a string>,
  //   }
  
  EVENT_TYPE(URL_REQUEST_FAKE_RESPONSE_HEADERS_CREATED)
  // This event is logged when a URLRequestRedirectJob creates the fake response
  // headers for a request, prior to returning them.
  // The following parameters are attached:
  //   {
  //     "headers": <The list of header:value pairs>,
  //   }
  
  // ------------------------------------------------------------------------
  // HttpCache
  // ------------------------------------------------------------------------
  
  // Measures the time while getting a reference to the back end.
  EVENT_TYPE(HTTP_CACHE_GET_BACKEND)
  
  // Measures the time while opening a disk cache entry.
  EVENT_TYPE(HTTP_CACHE_OPEN_ENTRY)
  
  // Measures the time while creating a disk cache entry.
  EVENT_TYPE(HTTP_CACHE_CREATE_ENTRY)
  
  // Measures the time it takes to add a HttpCache::Transaction to an http cache
  // entry's list of active Transactions.
  EVENT_TYPE(HTTP_CACHE_ADD_TO_ENTRY)
  
  // Measures the time while deleting a disk cache entry.
  EVENT_TYPE(HTTP_CACHE_DOOM_ENTRY)
  
  // Measures the time while reading/writing a disk cache entry's response headers
  // or metadata.
  EVENT_TYPE(HTTP_CACHE_READ_INFO)
  EVENT_TYPE(HTTP_CACHE_WRITE_INFO)
  
  // Measures the time while reading/writing a disk cache entry's body.
  EVENT_TYPE(HTTP_CACHE_READ_DATA)
  EVENT_TYPE(HTTP_CACHE_WRITE_DATA)
  
  // ------------------------------------------------------------------------
  // Disk Cache / Memory Cache
  // ------------------------------------------------------------------------
  
  // The creation/destruction of a disk_cache::EntryImpl object.  The "creation"
  // is considered to be the point at which an Entry is first considered to be
  // good and associated with a key.  Note that disk and memory cache entries
  // share event types.
  //
  // For the BEGIN phase, the following parameters are attached:
  //   {
  //     "created": <true if the Entry was created, rather than being opened>,
  //     "key": <The Entry's key>,
  //   }
  EVENT_TYPE(DISK_CACHE_ENTRY_IMPL)
  EVENT_TYPE(DISK_CACHE_MEM_ENTRY_IMPL)
  
  // Logs the time required to read/write data from/to a cache entry.
  //
  // For the BEGIN phase, the following parameters are attached:
  //   {
  //     "index": <Index being read/written>,
  //     "offset": <Offset being read/written>,
  //     "buf_len": <Length of buffer being read to/written from>,
  //     "truncate": <If present for a write, the truncate flag is set to true.
  //                  Not present in reads or writes where it is false>,
  //   }
  //
  // For the END phase, the following parameters are attached:
  //   {
  //     "bytes_copied": <Number of bytes copied.  Not present on error>,
  //     "net_error": <Network error code.  Only present on error>,
  //   }
  EVENT_TYPE(ENTRY_READ_DATA)
  EVENT_TYPE(ENTRY_WRITE_DATA)
  
  // Logged when sparse read/write operation starts/stops for an Entry.
  //
  // For the BEGIN phase, the following parameters are attached:
  //   {
  //     "offset": <Offset at which to start reading>,
  //     "buff_len": <Bytes to read/write>,
  //   }
  EVENT_TYPE(SPARSE_READ)
  EVENT_TYPE(SPARSE_WRITE)
  
  // Logged when a parent Entry starts/stops reading/writing a child Entry's data.
  //
  // For the BEGIN phase, the following parameters are attached:
  //   {
  //     "source_dependency": <Source id of the child entry>,
  //     "child_len": <Bytes to read/write from/to child>,
  //   }
  EVENT_TYPE(SPARSE_READ_CHILD_DATA)
  EVENT_TYPE(SPARSE_WRITE_CHILD_DATA)
  
  // Logged when sparse GetAvailableRange operation starts/stops for an Entry.
  //
  // For the BEGIN phase, the following parameters are attached:
  //   {
  //     "buff_len": <Bytes to read/write>,
  //     "offset": <Offset at which to start reading>,
  //   }
  //
  // For the END phase, the following parameters are attached.  No parameters are
  // attached when cancelled:
  //   {
  //     "length": <Length of returned range. Only present on success>,
  //     "start": <Position where returned range starts. Only present on success>,
  //     "net_error": <Resulting error code. Only present on failure. This may be
  //                   "OK" when there's no error, but no available bytes in the
  //                   range>,
  //   }
  EVENT_TYPE(SPARSE_GET_RANGE)
  
  // Indicates the children of a sparse EntryImpl are about to be deleted.
  // Not logged for MemEntryImpls.
  EVENT_TYPE(SPARSE_DELETE_CHILDREN)
  
  // Logged when an EntryImpl is closed.  Not logged for MemEntryImpls.
  EVENT_TYPE(ENTRY_CLOSE)
  
  // Logged when an entry is doomed.
  EVENT_TYPE(ENTRY_DOOM)
  
  // ------------------------------------------------------------------------
  // HttpStreamFactoryImpl
  // ------------------------------------------------------------------------
  
  // Measures the time taken to fulfill the HttpStreamRequest.
  EVENT_TYPE(HTTP_STREAM_REQUEST)
  
  // Measures the time taken to execute the HttpStreamFactoryImpl::Job
  EVENT_TYPE(HTTP_STREAM_JOB)
  
  // Identifies the NetLog::Source() for the Job that fulfilled the Request.
  // The event parameters are:
  //   {
  //      "source_dependency": <Source identifier for Job we acquired>,
  //   }
  EVENT_TYPE(HTTP_STREAM_REQUEST_BOUND_TO_JOB)
  
  // Identifies the NetLog::Source() for the Request that the Job was attached to.
  // The event parameters are:
  //   {
  //      "source_dependency": <Source identifier for the Request to which we were
  //                            attached>,
  //   }
  EVENT_TYPE(HTTP_STREAM_JOB_BOUND_TO_REQUEST)
  
  // Logs the protocol negotiated with the server. The event parameters are:
  //   {
  //      "status": <The NPN status ("negotiated", "unsupported", "no-overlap")>,
  //      "proto": <The NPN protocol negotiated>,
  //      "server_protos": <The list of server advertised protocols>,
  //   }
  EVENT_TYPE(HTTP_STREAM_REQUEST_PROTO)
  
  // ------------------------------------------------------------------------
  // HttpNetworkTransaction
  // ------------------------------------------------------------------------
  
  // Measures the time taken to send the tunnel request to the server.
  EVENT_TYPE(HTTP_TRANSACTION_TUNNEL_SEND_REQUEST)
  
  // This event is sent for a tunnel request.
  // The following parameters are attached:
  //   {
  //     "line": <The HTTP request line, CRLF terminated>,
  //     "headers": <The list of header:value pairs>,
  //   }
  EVENT_TYPE(HTTP_TRANSACTION_SEND_TUNNEL_HEADERS)
  
  // Measures the time to read the tunnel response headers from the server.
  EVENT_TYPE(HTTP_TRANSACTION_TUNNEL_READ_HEADERS)
  
  // This event is sent on receipt of the HTTP response headers to a tunnel
  // request.
  // The following parameters are attached:
  //   {
  //     "headers": <The list of header:value pairs>,
  //   }
  EVENT_TYPE(HTTP_TRANSACTION_READ_TUNNEL_RESPONSE_HEADERS)
  
  // Measures the time taken to send the request to the server.
  EVENT_TYPE(HTTP_TRANSACTION_SEND_REQUEST)
  
  // This event is sent for a HTTP request.
  // The following parameters are attached:
  //   {
  //     "line": <The HTTP request line, CRLF terminated>,
  //     "headers": <The list of header:value pairs>,
  //   }
  EVENT_TYPE(HTTP_TRANSACTION_SEND_REQUEST_HEADERS)
  
  // Logged when a request body is sent.
  // The following parameters are attached:
  //   {
  //     "did_merge": <True if the body was merged with the headers for writing>,
  //     "is_chunked": <True if chunked>,
  //     "length": <The length of the body.  May not be accurate when body is not
  //                in memory>
  //   }
  EVENT_TYPE(HTTP_TRANSACTION_SEND_REQUEST_BODY)
  
  // This event is sent for a HTTP request over a SPDY stream.
  // The following parameters are attached:
  //   {
  //     "headers": <The list of header:value pairs>,
  //   }
  EVENT_TYPE(HTTP_TRANSACTION_SPDY_SEND_REQUEST_HEADERS)
  
  // This event is sent for a HTTP request over a SPDY stream.
  // The following parameters are attached:
  //   {
  //     "headers": <The list of header:value pairs>,
  //     "quic_priority": <Integer representing the priority of this request>,
  //     "quic_stream_id": <Id of the QUIC stream sending this request>,
  //   }
  EVENT_TYPE(HTTP_TRANSACTION_QUIC_SEND_REQUEST_HEADERS)
  
  // Measures the time to read HTTP response headers from the server.
  EVENT_TYPE(HTTP_TRANSACTION_READ_HEADERS)
  
  // This event is sent on receipt of the HTTP response headers.
  // The following parameters are attached:
  //   {
  //     "headers": <The list of header:value pairs>,
  //   }
  EVENT_TYPE(HTTP_TRANSACTION_READ_RESPONSE_HEADERS)
  
  // Measures the time to read the entity body from the server.
  EVENT_TYPE(HTTP_TRANSACTION_READ_BODY)
  
  // Measures the time taken to read the response out of the socket before
  // restarting for authentication, on keep alive connections.
  EVENT_TYPE(HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART)
  
  // This event is sent when we try to restart a transaction after an error.
  // The following parameters are attached:
  //   {
  //     "net_error": <The net error code integer for the failure, if applicable>,
  //     "http_status_code": <HTTP status code indicating an error, if
  //                          applicable>,
  //   }
  EVENT_TYPE(HTTP_TRANSACTION_RESTART_AFTER_ERROR)
  
  // ------------------------------------------------------------------------
  // SpdySession
  // ------------------------------------------------------------------------
  
  // The start/end of a SpdySession.
  //   {
  //     "host": <The host-port string>,
  //     "proxy": <The Proxy PAC string>,
  //   }
  EVENT_TYPE(SPDY_SESSION)
  
  // The SpdySession has been initilized with a socket.
  //   {
  //     "source_dependency":  <Source identifier for the underlying socket>,
  //   }
  EVENT_TYPE(SPDY_SESSION_INITIALIZED)
  
  // This event is sent for a SPDY SYN_STREAM.
  // The following parameters are attached:
  //   {
  //     "flags": <The control frame flags>,
  //     "headers": <The list of header:value pairs>,
  //     "id": <The stream id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_SYN_STREAM)
  
  // This event is sent for a SPDY SYN_STREAM pushed by the server, where a
  // net::URLRequest is already waiting for the stream.
  // The following parameters are attached:
  //   {
  //     "flags": <The control frame flags>,
  //     "headers": <The list of header:value pairs>,
  //     "id": <The stream id>,
  //     "associated_stream": <The stream id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_PUSHED_SYN_STREAM)
  
  // This event is sent for a sending SPDY HEADERS frame.
  // The following parameters are attached:
  //   {
  //     "flags": <The control frame flags>,
  //     "headers": <The list of header:value pairs>,
  //     "id": <The stream id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_SEND_HEADERS)
  
  // This event is sent for a receiving SPDY HEADERS frame.
  // The following parameters are attached:
  //   {
  //     "flags": <The control frame flags>,
  //     "headers": <The list of header:value pairs>,
  //     "id": <The stream id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_RECV_HEADERS)
  
  // This event is sent for a SPDY SYN_REPLY.
  // The following parameters are attached:
  //   {
  //     "flags": <The control frame flags>,
  //     "headers": <The list of header:value pairs>,
  //     "id": <The stream id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_SYN_REPLY)
  
  // On sending a SPDY SETTINGS frame.
  // The following parameters are attached:
  //   {
  //     "settings": <The list of setting id, flags and value>,
  //   }
  EVENT_TYPE(SPDY_SESSION_SEND_SETTINGS)
  
  // Receipt of a SPDY SETTINGS frame is received.
  // The following parameters are attached:
  //   {
  //     "host": <The host-port string>,
  //     "clear_persisted": <Boolean indicating whether to clear all persisted
  //                         settings data for the given host>,
  //   }
  EVENT_TYPE(SPDY_SESSION_RECV_SETTINGS)
  
  // Receipt of a SPDY SETTING frame.
  // The following parameters are attached:
  //   {
  //     "id":    <The setting id>,
  //     "flags": <The setting flags>,
  //     "value": <The setting value>,
  //   }
  EVENT_TYPE(SPDY_SESSION_RECV_SETTING)
  
  // The receipt of a RST_STREAM
  // The following parameters are attached:
  //   {
  //     "stream_id": <The stream ID for the window update>,
  //     "status": <The reason for the RST_STREAM>,
  //   }
  EVENT_TYPE(SPDY_SESSION_RST_STREAM)
  
  // Sending of a RST_STREAM
  // The following parameters are attached:
  //   {
  //     "stream_id": <The stream ID for the window update>,
  //     "status": <The reason for the RST_STREAM>,
  //     "description": <The textual description for the RST_STREAM>,
  //   }
  EVENT_TYPE(SPDY_SESSION_SEND_RST_STREAM)
  
  // Sending of a SPDY PING frame.
  // The following parameters are attached:
  //   {
  //     "unique_id": <The unique id of the PING message>,
  //     "type": <The PING type ("sent", "received")>,
  //   }
  EVENT_TYPE(SPDY_SESSION_PING)
  
  // Receipt of a SPDY GOAWAY frame.
  // The following parameters are attached:
  //   {
  //     "last_accepted_stream_id": <Last stream id accepted by the server, duh>,
  //     "active_streams":          <Number of active streams>,
  //     "unclaimed_streams":       <Number of unclaimed push streams>,
  //     "status":                  <The reason for the GOAWAY>,
  //   }
  EVENT_TYPE(SPDY_SESSION_GOAWAY)
  
  // Receipt of a SPDY WINDOW_UPDATE frame (which controls the send window).
  //   {
  //     "stream_id": <The stream ID for the window update>,
  //     "delta"    : <The delta window size>,
  //   }
  EVENT_TYPE(SPDY_SESSION_RECEIVED_WINDOW_UPDATE_FRAME)
  
  // Sending of a SPDY WINDOW_UPDATE frame (which controls the receive window).
  //   {
  //     "stream_id": <The stream ID for the window update>,
  //     "delta"    : <The delta window size>,
  //   }
  EVENT_TYPE(SPDY_SESSION_SENT_WINDOW_UPDATE_FRAME)
  
  // This event indicates that the send window has been updated for a session.
  //   {
  //     "delta":      <The window size delta>,
  //     "new_window": <The new window size>,
  //   }
  EVENT_TYPE(SPDY_SESSION_UPDATE_SEND_WINDOW)
  
  // This event indicates that the recv window has been updated for a session.
  //   {
  //     "delta":      <The window size delta>,
  //     "new_window": <The new window size>,
  //   }
  EVENT_TYPE(SPDY_SESSION_UPDATE_RECV_WINDOW)
  
  // Sending of a SPDY CREDENTIAL frame (which sends a certificate or
  // certificate chain to the server).
  //   {
  //     "slot"     : <The slot that this certificate should be stored in>,
  //     "origin"   : <The origin this certificate should be used for>,
  //   }
  EVENT_TYPE(SPDY_SESSION_SEND_CREDENTIAL)
  
  // Sending a data frame
  //   {
  //     "stream_id": <The stream ID for the window update>,
  //     "length"   : <The size of data sent>,
  //     "flags"    : <Send data flags>,
  //   }
  EVENT_TYPE(SPDY_SESSION_SEND_DATA)
  
  // Receiving a data frame
  //   {
  //     "stream_id": <The stream ID for the window update>,
  //     "length"   : <The size of data received>,
  //     "flags"    : <Receive data flags>,
  //   }
  EVENT_TYPE(SPDY_SESSION_RECV_DATA)
  
  // This event is sent for a receiving SPDY PUSH_PROMISE frame.
  // The following parameters are attached:
  //   {
  //     "headers": <The list of header:value pairs>,
  //     "id": <The stream id>,
  //     "promised_stream_id": <The stream id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_RECV_PUSH_PROMISE)
  
  // A stream is stalled by the session send window being closed.
  EVENT_TYPE(SPDY_SESSION_STREAM_STALLED_BY_SESSION_SEND_WINDOW)
  
  // A stream is stalled by its send window being closed.
  EVENT_TYPE(SPDY_SESSION_STREAM_STALLED_BY_STREAM_SEND_WINDOW)
  
  // Session is closing
  //   {
  //     "net_error"  : <The error status of the closure>,
  //     "description": <The textual description for the closure>,
  //   }
  EVENT_TYPE(SPDY_SESSION_CLOSE)
  
  // Event when the creation of a stream is stalled because we're at
  // the maximum number of concurrent streams.
  EVENT_TYPE(SPDY_SESSION_STALLED_MAX_STREAMS)
  
  // Received a value for initial window size in SETTINGS frame with
  // flow control turned off.
  EVENT_TYPE(SPDY_SESSION_INITIAL_WINDOW_SIZE_NO_FLOW_CONTROL)
  
  // Received an out-of-range value for initial window size in SETTINGS
  // frame.
  //   {
  //     "initial_window_size"  : <The initial window size>,
  //   }
  EVENT_TYPE(SPDY_SESSION_INITIAL_WINDOW_SIZE_OUT_OF_RANGE)
  
  // Updating streams send window size by the delta window size.
  //   {
  //     "delta_window_size"    : <The delta window size>,
  //   }
  EVENT_TYPE(SPDY_SESSION_UPDATE_STREAMS_SEND_WINDOW_SIZE)
  
  // ------------------------------------------------------------------------
  // SpdySessionPool
  // ------------------------------------------------------------------------
  
  // This event indicates the pool is reusing an existing session
  //   {
  //     "source_dependency": <The session id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_POOL_FOUND_EXISTING_SESSION)
  
  // This event indicates the pool is reusing an existing session from an
  // IP pooling match.
  //   {
  //     "source_dependency": <The session id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_POOL_FOUND_EXISTING_SESSION_FROM_IP_POOL)
  
  // This event indicates the pool created a new session
  //   {
  //     "source_dependency": <The session id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_POOL_CREATED_NEW_SESSION)
  
  // This event indicates that a SSL socket has been upgraded to a SPDY session.
  //   {
  //     "source_dependency": <The session id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_POOL_IMPORTED_SESSION_FROM_SOCKET)
  
  // This event indicates that the session has been removed.
  //   {
  //     "source_dependency": <The session id>,
  //   }
  EVENT_TYPE(SPDY_SESSION_POOL_REMOVE_SESSION)
  
  // ------------------------------------------------------------------------
  // SpdyStream
  // ------------------------------------------------------------------------
  
  // The begin and end of a SPDY STREAM.
  EVENT_TYPE(SPDY_STREAM)
  
  // A stream is attached to a pushed stream.
  EVENT_TYPE(SPDY_STREAM_ADOPTED_PUSH_STREAM)
  
  // A stream is unstalled by flow control.
  EVENT_TYPE(SPDY_STREAM_FLOW_CONTROL_UNSTALLED)
  
  // This event indicates that the send window has been updated for a stream.
  //   {
  //     "id":         <The stream id>,
  //     "delta":      <The window size delta>,
  //     "new_window": <The new window size>,
  //   }
  EVENT_TYPE(SPDY_STREAM_UPDATE_SEND_WINDOW)
  
  // This event indicates that the recv window has been updated for a stream.
  //   {
  //     "id":         <The stream id>,
  //     "delta":      <The window size delta>,
  //     "new_window": <The new window size>,
  //   }
  EVENT_TYPE(SPDY_STREAM_UPDATE_RECV_WINDOW)
  
  // This event indicates a stream error
  //   {
  //     "id":          <The stream id>,
  //     "status":      <The error status>,
  //     "description": <The textual description for the error>,
  //   }
  EVENT_TYPE(SPDY_STREAM_ERROR)
  
  // ------------------------------------------------------------------------
  // SpdyProxyClientSocket
  // ------------------------------------------------------------------------
  
  EVENT_TYPE(SPDY_PROXY_CLIENT_SESSION)
  // Identifies the SPDY session a source is using.
  //   {
  //     "source_dependency":  <Source identifier for the underlying session>,
  //   }
  
  // ------------------------------------------------------------------------
  // QuicSession
  // ------------------------------------------------------------------------
  
  // The start/end of a QuicSession.
  //   {
  //     "host": <The host-port string>,
  //   }
  EVENT_TYPE(QUIC_SESSION)
  
  // Session is closing because of an error.
  //   {
  //     "net_error": <Net error code for the closure>,
  //   }
  EVENT_TYPE(QUIC_SESSION_CLOSE_ON_ERROR)
  
  // Session verified a certificate from the server.
  //   {
  //     "subjects": <list of DNS names that the certificate is valid for>,
  //   }
  EVENT_TYPE(QUIC_SESSION_CERTIFICATE_VERIFIED)
  
  // Session received a QUIC packet.
  //   {
  //     "peer_address": <The ip:port of the peer>,
  //     "self_address": <The local ip:port which received the packet>,
  //   }
  EVENT_TYPE(QUIC_SESSION_PACKET_RECEIVED)
  
  // Session sent a QUIC packet.
  //   {
  //     "encryption_level": <The EncryptionLevel of the packet>,
  //     "transmission_type": <The TransmissionType of the packet>,
  //     "packet_sequence_number": <The packet's full 64-bit sequence number,
  //                                as a base-10 string.>,
  //     "size": <The size of the packet in bytes>
  //   }
  EVENT_TYPE(QUIC_SESSION_PACKET_SENT)
  
  // Session retransmitted a QUIC packet.
  //   {
  //     "old_packet_sequence_number": <The old packet's full 64-bit sequence
  //                                    number, as a base-10 string.>,
  //     "new_packet_sequence_number": <The new packet's full 64-bit sequence
  //                                    number, as a base-10 string.>,
  //   }
  EVENT_TYPE(QUIC_SESSION_PACKET_RETRANSMITTED)
  
  // Session received a QUIC packet header for a valid packet.
  //   {
  //     "connection_id": <The 64-bit CONNECTION_ID for this connection, as a
  //                       base-10 string>,
  //     "public_flags": <The public flags set for this packet>,
  //     "packet_sequence_number": <The packet's full 64-bit sequence number,
  //                                as a base-10 string.>,
  //     "private_flags": <The private flags set for this packet>,
  //     "fec_group": <The FEC group of this packet>,
  //   }
  EVENT_TYPE(QUIC_SESSION_PACKET_HEADER_RECEIVED)
  
  // Session received a STREAM frame.
  //   {
  //     "stream_id": <The id of the stream which this data is for>,
  //     "fin": <True if this is the final data set by the peer on this stream>,
  //     "offset": <Offset in the byte stream where this data starts>,
  //     "length": <Length of the data in this frame>,
  //   }
  EVENT_TYPE(QUIC_SESSION_STREAM_FRAME_RECEIVED)
  
  // Session sent a STREAM frame.
  //   {
  //     "stream_id": <The id of the stream which this data is for>,
  //     "fin": <True if this is the final data set by the peer on this stream>,
  //     "offset": <Offset in the byte stream where this data starts>,
  //     "length": <Length of the data in this frame>,
  //   }
  EVENT_TYPE(QUIC_SESSION_STREAM_FRAME_SENT)
  
  // Session received an ACK frame.
  //   {
  //     "sent_info": <Details of packet sent by the peer>
  //       {
  //         "least_unacked": <Lowest sequence number of a packet sent by the peer
  //                           for which it has not received an ACK>,
  //       }
  //     "received_info": <Details of packet received by the peer>
  //       {
  //         "largest_observed": <The largest sequence number of a packet received
  //                               by (or inferred by) the peer>,
  //         "missing": <List of sequence numbers of packets lower than
  //                     largest_observed which have not been received by the
  //                     peer>,
  //       }
  //   }
  EVENT_TYPE(QUIC_SESSION_ACK_FRAME_RECEIVED)
  
  // Session sent an ACK frame.
  //   {
  //     "sent_info": <Details of packet sent by the peer>
  //       {
  //         "least_unacked": <Lowest sequence number of a packet sent by the peer
  //                           for which it has not received an ACK>,
  //       }
  //     "received_info": <Details of packet received by the peer>
  //       {
  //         "largest_observed": <The largest sequence number of a packet received
  //                               by (or inferred by) the peer>,
  //         "missing": <List of sequence numbers of packets lower than
  //                     largest_observed which have not been received by the
  //                     peer>,
  //       }
  //   }
  EVENT_TYPE(QUIC_SESSION_ACK_FRAME_SENT)
  
  // Session received a WINDOW_UPDATE frame.
  //   {
  //     "stream_id": <The id of the stream which this data is for>,
  //     "byte_offset": <Byte offset in the stream>,
  //   }
  EVENT_TYPE(QUIC_SESSION_WINDOW_UPDATE_FRAME_RECEIVED)
  
  // Session sent a WINDOW_UPDATE frame.
  //   {
  //     "stream_id": <The id of the stream which this data is for>,
  //     "byte_offset": <Byte offset in the stream>,
  //   }
  EVENT_TYPE(QUIC_SESSION_WINDOW_UPDATE_FRAME_SENT)
  
  // Session received a BLOCKED frame.
  //   {
  //     "stream_id": <The id of the stream which this data is for>,
  //   }
  EVENT_TYPE(QUIC_SESSION_BLOCKED_FRAME_RECEIVED)
  
  // Session sent a BLOCKED frame.
  //   {
  //     "stream_id": <The id of the stream which this data is for>,
  //   }
  EVENT_TYPE(QUIC_SESSION_BLOCKED_FRAME_SENT)
  
  // Session received a GOAWAY frame.
  //   {
  //     "quic_error":          <QuicErrorCode in the frame>,
  //     "last_good_stream_id": <Last correctly received stream id by the server>,
  //     "reason_phrase":       <Prose justifying go-away request>,
  //   }
  EVENT_TYPE(QUIC_SESSION_GOAWAY_FRAME_RECEIVED)
  
  // Session sent a GOAWAY frame.
  //   {
  //     "quic_error":          <QuicErrorCode in the frame>,
  //     "last_good_stream_id": <Last correctly received stream id by the server>,
  //     "reason_phrase":       <Prose justifying go-away request>,
  //   }
  EVENT_TYPE(QUIC_SESSION_GOAWAY_FRAME_SENT)
  
  // Session received a PING frame.
  EVENT_TYPE(QUIC_SESSION_PING_FRAME_RECEIVED)
  
  // Session sent a PING frame.
  EVENT_TYPE(QUIC_SESSION_PING_FRAME_SENT)
  
  // Session received a STOP_WAITING frame.
  //   {
  //     "sent_info": <Details of packet sent by the peer>
  //       {
  //         "least_unacked": <Lowest sequence number of a packet sent by the peer
  //                           for which it has not received an ACK>,
  //       }
  //   }
  EVENT_TYPE(QUIC_SESSION_STOP_WAITING_FRAME_RECEIVED)
  
  // Session sent an STOP_WAITING frame.
  //   {
  //     "sent_info": <Details of packet sent by the peer>
  //       {
  //         "least_unacked": <Lowest sequence number of a packet sent by the peer
  //                           for which it has not received an ACK>,
  //       }
  //   }
  EVENT_TYPE(QUIC_SESSION_STOP_WAITING_FRAME_SENT)
  
  // Session recevied a RST_STREAM frame.
  //   {
  //     "offset": <Offset in the byte stream which triggered the reset>,
  //     "quic_rst_stream_error": <QuicRstStreamErrorCode in the frame>,
  //     "details": <Human readable description>,
  //   }
  EVENT_TYPE(QUIC_SESSION_RST_STREAM_FRAME_RECEIVED)
  
  // Session sent a RST_STREAM frame.
  //   {
  //     "offset": <Offset in the byte stream which triggered the reset>,
  //     "quic_rst_stream_error": <QuicRstStreamErrorCode in the frame>,
  //     "details": <Human readable description>,
  //   }
  EVENT_TYPE(QUIC_SESSION_RST_STREAM_FRAME_SENT)
  
  // Session received a CONGESTION_FEEDBACK frame.
  //   {
  //     "type": <The specific type of feedback being provided>,
  //     Other per-feedback type details:
  //
  //     for InterArrival:
  //     "accumulated_number_of_lost_packets": <Total number of lost packets
  //                                            over the life of this session>,
  //     "received_packets": <List of strings of the form:
  //                          <sequence_number>@<receive_time_in_ms>>,
  //
  //     for FixRate:
  //     "bitrate_in_bytes_per_second": <The configured bytes per second>,
  //
  //     for TCP:
  //     "accumulated_number_of_lost_packets": <Total number of lost packets
  //                                            over the life of this session>,
  //     "receive_window": <Number of bytes in the receive window>,
  //   }
  EVENT_TYPE(QUIC_SESSION_CONGESTION_FEEDBACK_FRAME_RECEIVED)
  
  // Session received a CONGESTION_FEEDBACK frame.
  //   {
  //     "type": <The specific type of feedback being provided>,
  //     Other per-feedback type details:
  //
  //     for InterArrival:
  //     "accumulated_number_of_lost_packets": <Total number of lost packets
  //                                            over the life of this session>,
  //     "received_packets": <List of strings of the form:
  //                          <sequence_number>@<receive_time_in_ms>>,
  //
  //     for FixRate:
  //     "bitrate_in_bytes_per_second": <The configured bytes per second>,
  //
  //     for TCP:
  //     "accumulated_number_of_lost_packets": <Total number of lost packets
  //                                            over the life of this session>,
  //     "receive_window": <Number of bytes in the receive window>,
  //   }
  EVENT_TYPE(QUIC_SESSION_CONGESTION_FEEDBACK_FRAME_SENT)
  
  // Session received a CONNECTION_CLOSE frame.
  //   {
  //     "quic_error": <QuicErrorCode in the frame>,
  //     "details": <Human readable description>,
  //   }
  EVENT_TYPE(QUIC_SESSION_CONNECTION_CLOSE_FRAME_RECEIVED)
  
  // Session received a CONNECTION_CLOSE frame.
  //   {
  //     "quic_error": <QuicErrorCode in the frame>,
  //     "details": <Human readable description>,
  //   }
  EVENT_TYPE(QUIC_SESSION_CONNECTION_CLOSE_FRAME_SENT)
  
  // Session received a public reset packet.
  //   {
  //   }
  EVENT_TYPE(QUIC_SESSION_PUBLIC_RESET_PACKET_RECEIVED)
  
  // Session received a version negotiation packet.
  //   {
  //     "versions": <List of QUIC versions supported by the server>,
  //   }
  EVENT_TYPE(QUIC_SESSION_VERSION_NEGOTIATION_PACKET_RECEIVED)
  
  // Session sucessfully negotiated QUIC version number.
  //   {
  //     "version": <String of QUIC version negotiated with the server>,
  //   }
  EVENT_TYPE(QUIC_SESSION_VERSION_NEGOTIATED)
  
  // Session revived a QUIC packet packet via FEC.
  //   {
  //     "connection_id": <The 64-bit CONNECTION_ID for this connection, as a
  //                       base-10 string>,
  //     "public_flags": <The public flags set for this packet>,
  //     "packet_sequence_number": <The packet's full 64-bit sequence number,
  //                                as a base-10 string.>,
  //     "private_flags": <The private flags set for this packet>,
  //     "fec_group": <The FEC group of this packet>,
  //   }
  EVENT_TYPE(QUIC_SESSION_PACKET_HEADER_REVIVED)
  
  // Session received a crypto handshake message.
  //   {
  //     "quic_crypto_handshake_message": <The human readable dump of the message
  //                                       contents>
  //   }
  EVENT_TYPE(QUIC_SESSION_CRYPTO_HANDSHAKE_MESSAGE_RECEIVED)
  
  // Session sent a crypto handshake message.
  //   {
  //     "quic_crypto_handshake_message": <The human readable dump of the message
  //                                       contents>
  //   }
  EVENT_TYPE(QUIC_SESSION_CRYPTO_HANDSHAKE_MESSAGE_SENT)
  
  // Session was closed, either remotely or by the peer.
  //   {
  //     "quic_error": <QuicErrorCode which caused the connection to be closed>,
  //     "from_peer":  <True if the peer closed the connection>
  //   }
  EVENT_TYPE(QUIC_SESSION_CLOSED)
  
  // ------------------------------------------------------------------------
  // QuicHttpStream
  // ------------------------------------------------------------------------
  
  // The stream is sending the request headers.
  //   {
  //     "headers": <The list of header:value pairs>
  //   }
  EVENT_TYPE(QUIC_HTTP_STREAM_SEND_REQUEST_HEADERS)
  
  // The stream has read the response headers.
  //   {
  //     "headers": <The list of header:value pairs>
  //   }
  EVENT_TYPE(QUIC_HTTP_STREAM_READ_RESPONSE_HEADERS)
  
  // ------------------------------------------------------------------------
  // HttpStreamParser
  // ------------------------------------------------------------------------
  
  // Measures the time to read HTTP response headers from the server.
  EVENT_TYPE(HTTP_STREAM_PARSER_READ_HEADERS)
  
  // ------------------------------------------------------------------------
  // SocketStream
  // ------------------------------------------------------------------------
  
  // Measures the time between SocketStream::Connect() and
  // SocketStream::DidEstablishConnection()
  //
  // For the BEGIN phase, the following parameters are attached:
  //   {
  //      "url": <String of URL being loaded>,
  //   }
  //
  // For the END phase, if there was an error, the following parameters are
  // attached:
  //   {
  //      "net_error": <Net error code of the failure>,
  //   }
  EVENT_TYPE(SOCKET_STREAM_CONNECT)
  
  // A message sent on the SocketStream.
  EVENT_TYPE(SOCKET_STREAM_SENT)
  
  // A message received on the SocketStream.
  EVENT_TYPE(SOCKET_STREAM_RECEIVED)
  
  // ------------------------------------------------------------------------
  // WebSocketJob
  // ------------------------------------------------------------------------
  
  // This event is sent for a WebSocket handshake request.
  // The following parameters are attached:
  //   {
  //     "headers": <handshake request message>,
  //   }
  EVENT_TYPE(WEB_SOCKET_SEND_REQUEST_HEADERS)
  
  // This event is sent on receipt of the WebSocket handshake response headers.
  // The following parameters are attached:
  //   {
  //     "headers": <handshake response message>,
  //   }
  EVENT_TYPE(WEB_SOCKET_READ_RESPONSE_HEADERS)
  
  // ------------------------------------------------------------------------
  // SOCKS5ClientSocket
  // ------------------------------------------------------------------------
  
  // The time spent sending the "greeting" to the SOCKS server.
  EVENT_TYPE(SOCKS5_GREET_WRITE)
  
  // The time spent waiting for the "greeting" response from the SOCKS server.
  EVENT_TYPE(SOCKS5_GREET_READ)
  
  // The time spent sending the CONNECT request to the SOCKS server.
  EVENT_TYPE(SOCKS5_HANDSHAKE_WRITE)
  
  // The time spent waiting for the response to the CONNECT request.
  EVENT_TYPE(SOCKS5_HANDSHAKE_READ)
  
  // ------------------------------------------------------------------------
  // HTTP Authentication
  // ------------------------------------------------------------------------
  
  // The time spent authenticating to the proxy.
  EVENT_TYPE(AUTH_PROXY)
  
  // The time spent authentication to the server.
  EVENT_TYPE(AUTH_SERVER)
  
  // ------------------------------------------------------------------------
  // HTML5 Application Cache
  // ------------------------------------------------------------------------
  
  // This event is emitted whenever a request is satistifed directly from
  // the appache.
  EVENT_TYPE(APPCACHE_DELIVERING_CACHED_RESPONSE)
  
  // This event is emitted whenever the appcache uses a fallback response.
  EVENT_TYPE(APPCACHE_DELIVERING_FALLBACK_RESPONSE)
  
  // This event is emitted whenever the appcache generates an error response.
  EVENT_TYPE(APPCACHE_DELIVERING_ERROR_RESPONSE)
  
  // This event is emitted whenever the appcache executes script to compute
  // a response.
  EVENT_TYPE(APPCACHE_DELIVERING_EXECUTABLE_RESPONSE)
  
  // ------------------------------------------------------------------------
  // Global events
  // ------------------------------------------------------------------------
  // These are events which are not grouped by source id, as they have no
  // context.
  
  // This event is emitted whenever NetworkChangeNotifier determines that an
  // active network adapter's IP address has changed.
  EVENT_TYPE(NETWORK_IP_ADDRESSES_CHANGED)
  
  // This event is emitted whenever NetworkChangeNotifier determines that an
  // active network adapter's connectivity status has changed.
  //   {
  //     "new_connection_type": <Type of the new connection>
  //   }
  EVENT_TYPE(NETWORK_CONNECTIVITY_CHANGED)
  
  // This event is emitted whenever NetworkChangeNotifier determines that a change
  // occurs to the host computer's hardware or software that affects the route
  // network packets take to any network server.
  //   {
  //     "new_connection_type": <Type of the new connection>
  //   }
  EVENT_TYPE(NETWORK_CHANGED)
  
  // This event is emitted whenever HostResolverImpl receives a new DnsConfig
  // from the DnsConfigService.
  //   {
  //     "nameservers":                <List of name server IPs>,
  //     "search":                     <List of domain suffixes>,
  //     "num_hosts":                  <Number of entries in the HOSTS file>,
  //     <other>:                      <See DnsConfig>
  //   }
  EVENT_TYPE(DNS_CONFIG_CHANGED)
  
  // ------------------------------------------------------------------------
  // Exponential back-off throttling events
  // ------------------------------------------------------------------------
  
  // Emitted when back-off is disabled for a given host, or the first time
  // a localhost URL is used (back-off is always disabled for localhost).
  //   {
  //     "host": <The hostname back-off was disabled for>
  //   }
  EVENT_TYPE(THROTTLING_DISABLED_FOR_HOST)
  
  // Emitted when a request is denied due to exponential back-off throttling.
  //   {
  //     "url":              <URL that was being requested>,
  //     "num_failures":     <Failure count for the URL>,
  //     "release_after_ms": <Number of milliseconds until URL will be unblocked>
  //   }
  EVENT_TYPE(THROTTLING_REJECTED_REQUEST)
  
  // ------------------------------------------------------------------------
  // DnsTransaction
  // ------------------------------------------------------------------------
  
  // The start/end of a DnsTransaction.
  //
  // The BEGIN phase contains the following parameters:
  //
  // {
  //   "hostname": <The hostname it is trying to resolve>,
  //   "query_type": <Type of the query>,
  // }
  //
  // The END phase contains the following parameters:
  //
  // {
  //   "net_error": <The net error code for the failure, if any>,
  // }
  EVENT_TYPE(DNS_TRANSACTION)
  
  // The start/end of a DnsTransaction query for a fully-qualified domain name.
  //
  // The BEGIN phase contains the following parameters:
  //
  // {
  //   "qname": <The fully-qualified domain name it is trying to resolve>,
  // }
  //
  // The END phase contains the following parameters:
  //
  // {
  //   "net_error": <The net error code for the failure, if any>,
  // }
  EVENT_TYPE(DNS_TRANSACTION_QUERY)
  
  // This event is created when DnsTransaction creates a new UDP socket and
  // tries to resolve the fully-qualified name.
  //
  // It has a single parameter:
  //
  //   {
  //     "source_dependency": <Source id of the UDP socket created for the
  //                           attempt>,
  //   }
  EVENT_TYPE(DNS_TRANSACTION_ATTEMPT)
  
  // This event is created when DnsTransaction creates a new TCP socket and
  // tries to resolve the fully-qualified name.
  //
  // It has a single parameter:
  //
  //   {
  //     "source_dependency": <Source id of the TCP socket created for the
  //                           attempt>,
  //   }
  EVENT_TYPE(DNS_TRANSACTION_TCP_ATTEMPT)
  
  // This event is created when DnsTransaction receives a matching response.
  //
  // It has the following parameters:
  //
  //   {
  //     "rcode": <rcode in the received response>,
  //     "answer_count": <answer_count in the received response>,
  //     "source_dependency": <Source id of the UDP socket that received the
  //                           response>,
  //   }
  EVENT_TYPE(DNS_TRANSACTION_RESPONSE)
  
  // ------------------------------------------------------------------------
  // ChromeExtension
  // ------------------------------------------------------------------------
  
  // TODO(eroman): This is a layering violation. Fix this in the context
  // of http://crbug.com/90674.
  
  // This event is created when a Chrome extension aborts a request.
  //
  //  {
  //    "extension_id": <Extension ID that caused the abortion>
  //  }
  EVENT_TYPE(CHROME_EXTENSION_ABORTED_REQUEST)
  
  // This event is created when a Chrome extension redirects a request.
  //
  //  {
  //    "extension_id": <Extension ID that caused the redirection>
  //  }
  EVENT_TYPE(CHROME_EXTENSION_REDIRECTED_REQUEST)
  
  // This event is created when a Chrome extension modifieds the headers of a
  // request.
  //
  //  {
  //    "extension_id":     <Extension ID that caused the modification>,
  //    "modified_headers": [ "<header>: <value>", ... ],
  //    "deleted_headers":  [ "<header>", ... ]
  //  }
  EVENT_TYPE(CHROME_EXTENSION_MODIFIED_HEADERS)
  
  // This event is created when a Chrome extension tried to modify a request
  // but was ignored due to a conflict.
  //
  //  {
  //    "extension_id": <Extension ID that was ignored>
  //  }
  EVENT_TYPE(CHROME_EXTENSION_IGNORED_DUE_TO_CONFLICT)
  
  // This event is created when a Chrome extension provides authentication
  // credentials.
  //
  //  {
  //    "extension_id": <Extension ID that provides credentials>
  //  }
  EVENT_TYPE(CHROME_EXTENSION_PROVIDE_AUTH_CREDENTIALS)
  
  // ------------------------------------------------------------------------
  // HostBlacklistManager
  // ------------------------------------------------------------------------
  
  // TODO(joaodasilva): Layering violation, see comment above.
  // http://crbug.com/90674.
  
  // This event is created when a request is blocked by a policy.
  EVENT_TYPE(CHROME_POLICY_ABORTED_REQUEST)
  
  // ------------------------------------------------------------------------
  // CertVerifier
  // ------------------------------------------------------------------------
  
  // This event is created when we start a CertVerifier request.
  EVENT_TYPE(CERT_VERIFIER_REQUEST)
  
  // This event is created when we start a CertVerifier job.
  // The BEGIN phase event parameters are:
  // {
  //   "certificates": <A list of PEM encoded certificates, the first one
  //                    being the certificate to verify and the remaining
  //                    being intermediate certificates to assist path
  //                    building. Only present when byte logging is enabled.>
  // }
  //
  // The END phase event parameters are:
  //   {
  //     "cert_status": <Bitmask of CERT_STATUS_*
  //                     from net/base/cert_status_flags.h>
  //     "common_name_fallback_used": <True if a fallback to the common name
  //                                   was used when matching the host
  //                                   name, rather than using the
  //                                   subjectAltName.>
  //     "has_md2": <True if a certificate in the certificate chain is signed with
  //                 a MD2 signature.>
  //     "has_md4": <True if a certificate in the certificate chain is signed with
  //                 a MD4 signature.>
  //     "has_md5": <True if a certificate in the certificate chain is signed with
  //                 a MD5 signature.>
  //     "is_issued_by_additional_trust_anchor": <True if the root CA used for
  //                                              this verification came from the
  //                                              list of additional trust
  //                                              anchors.>
  //     "is_issued_by_known_root": <True if we recognise the root CA as a
  //                                 standard root.  If it isn't then it's
  //                                 probably the case that this certificate
  //                                 was generated by a MITM proxy whose root
  //                                 has been installed locally. This is
  //                                 meaningless if the certificate was not
  //                                 trusted.>
  //     "public_key_hashes": <If the certificate was successfully verified then
  //                           this contains the hashes, in several hash
  //                           algorithms, of the SubjectPublicKeyInfos of the
  //                           chain.>
  //     "verified_cert": <The certificate chain that was constructed
  //                       during verification. Note that though the verified
  //                       certificate will match the originally supplied
  //                       certificate, the intermediate certificates stored
  //                       within may be substantially different. In the event
  //                       of a verification failure, this will contain the
  //                       chain as supplied by the server. This may be NULL
  //                       if running within the sandbox.>
  //   }
  EVENT_TYPE(CERT_VERIFIER_JOB)
  
  // This event is created when a CertVerifier request attaches to a job.
  //
  // The event parameters are:
  //   {
  //      "source_dependency": <Source identifer for the job we are bound to>,
  //   }
  EVENT_TYPE(CERT_VERIFIER_REQUEST_BOUND_TO_JOB)
  
  // ------------------------------------------------------------------------
  // Download start events.
  // ------------------------------------------------------------------------
  
  // This event is created when a download is started, and lets the URL request
  // event source know what download source it is using.
  //   {
  //     "source_dependency": <Source id of the download>,
  //   }
  EVENT_TYPE(DOWNLOAD_STARTED)
  
  // This event is created when a download is started, and lets the download
  // event source know what URL request it's associated with.
  //   {
  //     "source_dependency": <Source id of the request being waited on>,
  //   }
  EVENT_TYPE(DOWNLOAD_URL_REQUEST)
  
  // ------------------------------------------------------------------------
  // DownloadItem events.
  // ------------------------------------------------------------------------
  
  // This event lives for as long as a download item is active.
  // The BEGIN event occurs right after constrction, and has the following
  // parameters:
  //   {
  //     "type": <New/history/save page>,
  //     "id": <Download ID>,
  //     "original_url": <URL that initiated the download>,
  //     "final_url": <URL of the actual download file>,
  //     "file_name": <initial file name, based on DownloadItem's members:
  //                   For History downloads it's the |full_path_|
  //                   For other downloads, uses the first non-empty variable of:
  //                     |state_info.force_filename|
  //                     |suggested_filename_|
  //                     the filename specified in the final URL>,
  //     "danger_type": <NOT_DANGEROUS, DANGEROUS_FILE, DANGEROUS_URL,
  //                     DANGEROUS_CONTENT, MAYBE_DANGEROUS_CONTENT,
  //                     UNCOMMON_CONTENT, USER_VALIDATED, DANGEROUS_HOST,
  //                     POTENTIALLY_UNWANTED>,
  //     "start_offset": <Where to start writing (defaults to 0)>,
  //     "has_user_gesture": <Whether or not we think the user initiated
  //                          the download>
  //   }
  // The END event will occur when the download is interrupted, canceled or
  // completed.
  // DownloadItems that are loaded from history and are never active simply ADD
  // one of these events.
  EVENT_TYPE(DOWNLOAD_ITEM_ACTIVE)
  
  // This event is created when a download item's danger type
  // has been modified.
  //   {
  //     "danger_type": <The new danger type.  See above for possible values.>,
  //   }
  EVENT_TYPE(DOWNLOAD_ITEM_SAFETY_STATE_UPDATED)
  
  // This event is created when a download item is updated.
  //   {
  //     "bytes_so_far": <Number of bytes received>,
  //     "hash_state": <Current hash state, as a hex-encoded binary string>,
  //   }
  EVENT_TYPE(DOWNLOAD_ITEM_UPDATED)
  
  // This event is created when a download item is renamed.
  //   {
  //     "old_filename": <Old file name>,
  //     "new_filename": <New file name>,
  //   }
  EVENT_TYPE(DOWNLOAD_ITEM_RENAMED)
  
  // This event is created when a download item is interrupted.
  //   {
  //     "interrupt_reason": <The reason for the interruption>,
  //     "bytes_so_far": <Number of bytes received>,
  //     "hash_state": <Current hash state, as a hex-encoded binary string>,
  //   }
  EVENT_TYPE(DOWNLOAD_ITEM_INTERRUPTED)
  
  // This event is created when a download item is resumed.
  //   {
  //     "user_initiated": <True if user initiated resume>,
  //     "reason": <The reason for the interruption>,
  //     "bytes_so_far": <Number of bytes received>,
  //     "hash_state": <Current hash state, as a hex-encoded binary string>,
  //   }
  EVENT_TYPE(DOWNLOAD_ITEM_RESUMED)
  
  // This event is created when a download item is completing.
  //   {
  //     "bytes_so_far": <Number of bytes received>,
  //     "final_hash": <Final hash, as a hex-encoded binary string>,
  //   }
  EVENT_TYPE(DOWNLOAD_ITEM_COMPLETING)
  
  // This event is created when a download item is finished.
  //   {
  //     "auto_opened": <Whether or not the download was auto-opened>
  //   }
  EVENT_TYPE(DOWNLOAD_ITEM_FINISHED)
  
  // This event is created when a download item is canceled.
  //   {
  //     "bytes_so_far": <Number of bytes received>,
  //     "hash_state": <Current hash state, as a hex-encoded binary string>,
  //   }
  EVENT_TYPE(DOWNLOAD_ITEM_CANCELED)
  
  // ------------------------------------------------------------------------
  // DownloadFile events.
  // ------------------------------------------------------------------------
  
  // This event is created when a download file is opened, and lasts until
  // the file is closed.
  // The BEGIN event has the following parameters:
  //   {
  //     "file_name": <The name of the file>,
  //     "start_offset": <The position at which to start writing>,
  //   }
  EVENT_TYPE(DOWNLOAD_FILE_OPENED)
  
  // This event is created when the stream between download source
  // and download file is drained.
  //   {
  //     "stream_size": <Total size of all bytes drained from the stream>
  //     "num_buffers": <How many separate buffers those bytes were in>
  //   }
  EVENT_TYPE(DOWNLOAD_STREAM_DRAINED)
  
  // This event is created when a download file is renamed.
  //   {
  //     "old_filename": <Old filename>,
  //     "new_filename": <New filename>,
  //   }
  EVENT_TYPE(DOWNLOAD_FILE_RENAMED)
  
  // This event is created when a download file is closed.  This event is allowed
  // to occur even if the file is not open.
  EVENT_TYPE(DOWNLOAD_FILE_CLOSED)
  
  // This event is created when a download file is detached.
  EVENT_TYPE(DOWNLOAD_FILE_DETACHED)
  
  // This event is created when a download file is deleted.
  EVENT_TYPE(DOWNLOAD_FILE_DELETED)
  
  // This event is created when a download file operation has an error.
  //   {
  //     "operation": <open, write, close, etc>,
  //     "net_error": <net::Error code>,
  //     "os_error": <OS depedent error code>
  //     "interrupt_reason": <Download interrupt reason>
  //   }
  EVENT_TYPE(DOWNLOAD_FILE_ERROR)
  
  // This event is created when a download file is annotating with source
  // information (for Mark Of The Web and anti-virus integration).
  EVENT_TYPE(DOWNLOAD_FILE_ANNOTATED)
  
  // ------------------------------------------------------------------------
  // FileStream events.
  // ------------------------------------------------------------------------
  
  // This event lasts the lifetime of a file stream.
  EVENT_TYPE(FILE_STREAM_ALIVE)
  
  // This event is created when a file stream is associated with a NetLog source.
  // It indicates what file stream event source is used.
  //   {
  //     "source_dependency": <Source id of the file stream>,
  //   }
  EVENT_TYPE(FILE_STREAM_SOURCE)
  
  // This event is created when a file stream is associated with a NetLog source.
  // It indicates what event source owns the file stream source.
  //   {
  //     "source_dependency": <Source id of the owner of the file stream>,
  //   }
  EVENT_TYPE(FILE_STREAM_BOUND_TO_OWNER)
  
  // Mark the opening/closing of a file stream.
  // The BEGIN event has the following parameters:
  //   {
  //     "file_name".
  //   }
  EVENT_TYPE(FILE_STREAM_OPEN)
  
  // This event is created when a file stream operation has an error.
  //   {
  //     "operation": <open, write, close, etc>,
  //     "os_error": <OS-dependent error code>,
  //     "net_error": <net::Error code>,
  //   }
  EVENT_TYPE(FILE_STREAM_ERROR)
  
  // -----------------------------------------------------------------------------
  // FTP events.
  // -----------------------------------------------------------------------------
  
  // This event is created when an FTP command is sent. It contains following
  // parameters:
  //   {
  //     "command": <String - the command sent to remote server>
  //   }
  EVENT_TYPE(FTP_COMMAND_SENT)
  
  // This event is created when FTP control connection is made. It contains
  // following parameters:
  //   {
  //     "source_dependency": <id of log for control connection socket>
  //   }
  EVENT_TYPE(FTP_CONTROL_CONNECTION)
  
  // This event is created when FTP data connection is made. It contains
  // following parameters:
  //   {
  //     "source_dependency": <id of log for data connection socket>
  //   }
  EVENT_TYPE(FTP_DATA_CONNECTION)
  
  // This event is created when FTP control connection response is processed.
  // It contains following parameters:
  //   {
  //     "lines": <list of strings - each representing a line of the response>
  //     "status_code": <numeric status code of the response>
  //   }
  EVENT_TYPE(FTP_CONTROL_RESPONSE)
  
  // -----------------------------------------------------------------------------
  // Simple Cache events.
  // -----------------------------------------------------------------------------
  
  // This event lasts the lifetime of a Simple Cache entry.
  // It contains the following parameter:
  //   {
  //     "entry_hash": <hash of the entry, formatted as a hex string>
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY)
  
  // This event is created when the entry's key is set.
  // It contains the following parameter:
  //   {
  //     "key": <key of the entry>
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_SET_KEY)
  
  // This event is created when OpenEntry is called.  It has no parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_OPEN_CALL)
  
  // This event is created when the Simple Cache actually begins opening the
  // cache entry.  It has no parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_OPEN_BEGIN)
  
  // This event is created when the Simple Cache finishes the OpenEntry call.
  // It contains the following parameter:
  // {
  //   "net_error": <net error code returned from the call>
  // }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_OPEN_END)
  
  // This event is created when CreateEntry is called.  It has no parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CREATE_CALL)
  
  // This event is created when the Simple Cache optimistically returns a result
  // from a CreateEntry call before it performs the create operation.
  // It contains the following parameter:
  // {
  //   "net_error": <net error code returned from the call>
  // }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CREATE_OPTIMISTIC)
  
  // This event is created when the Simple Cache actually begins creating the
  // cache entry.  It has no parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CREATE_BEGIN)
  
  // This event is created when the Simple Cache finishes the CreateEntry call.
  // It contains the following parameter:
  // {
  //   "net_error": <net error code returned from the call>
  // }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CREATE_END)
  
  // This event is created when ReadEntry is called.
  // It contains the following parameters:
  //   {
  //     "index": <Index being read/written>,
  //     "offset": <Offset being read/written>,
  //     "buf_len": <Length of buffer being read to/written from>,
  //     "truncate": <If present for a write, the truncate flag is set to true.
  //                  Not present in reads or writes where it is false>,
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_READ_CALL)
  
  // This event is created when the Simple Cache actually begins reading data
  // from the cache entry.
  // It contains the following parameters:
  //   {
  //     "index": <Index being read/written>,
  //     "offset": <Offset being read/written>,
  //     "buf_len": <Length of buffer being read to/written from>,
  //     "truncate": <If present for a write, the truncate flag is set to true.
  //                  Not present in reads or writes where it is false>,
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_READ_BEGIN)
  
  // This event is created when the Simple Cache finishes a ReadEntry call.
  // It contains the following parameters:
  //   {
  //     "bytes_copied": <Number of bytes copied.  Not present on error>,
  //     "net_error": <Network error code.  Only present on error>,
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_READ_END)
  
  // This event is created when the Simple Cache begins to verify the checksum of
  // cached data it has just read.  It occurs before READ_END, and contains no
  // parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CHECKSUM_BEGIN)
  
  // This event is created when the Simple Cache finishes verifying the checksum
  // of cached data.  It occurs after CHECKSUM_BEGIN but before READ_END, and
  // contains one parameter:
  // {
  //   "net_error": <net error code returned from the internal checksum call>
  // }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CHECKSUM_END)
  
  // This event is created when WriteEntry is called.
  // It contains the following parameters:
  //   {
  //     "index": <Index being read/written>,
  //     "offset": <Offset being read/written>,
  //     "buf_len": <Length of buffer being read to/written from>,
  //     "truncate": <If present for a write, the truncate flag is set to true.
  //                  Not present in reads or writes where it is false>,
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_WRITE_CALL)
  
  // This event is created when the Simple Cache optimistically returns a result
  // from a WriteData call before it performs the write operation.
  // It contains the following parameters:
  //   {
  //     "bytes_copied": <Number of bytes copied.  Not present on error>,
  //     "net_error": <Network error code.  Only present on error>,
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_WRITE_OPTIMISTIC)
  
  // This event is created when the Simple Cache actually begins writing data to
  // the cache entry.
  // It contains the following parameters:
  //   {
  //     "index": <Index being read/written>,
  //     "offset": <Offset being read/written>,
  //     "buf_len": <Length of buffer being read to/written from>,
  //     "truncate": <If present for a write, the truncate flag is set to true.
  //                  Not present in reads or writes where it is false>,
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_WRITE_BEGIN)
  
  // This event is created when the Simple Cache finishes a WriteEntry call.
  // It contains the following parameters:
  //   {
  //     "bytes_copied": <Number of bytes copied.  Not present on error>,
  //     "net_error": <Network error code.  Only present on error>,
  //   }
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_WRITE_END)
  
  // This event is created when DoomEntry is called.  It contains no parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_DOOM_CALL)
  
  // This event is created when the Simple Cache actually starts dooming a cache
  // entry.  It contains no parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_DOOM_BEGIN)
  
  // This event is created when the Simple Cache finishes dooming an entry.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_DOOM_END)
  
  // This event is created when CloseEntry is called.  It contains no parameters.
  // A Close call may not result in CLOSE_BEGIN and CLOSE_END if there are still
  // more references to the entry remaining.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CLOSE_CALL)
  
  // This event is created when the Simple Cache actually starts closing a cache
  // entry.  It contains no parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CLOSE_BEGIN)
  
  // This event is created when the Simple Cache finishes a CloseEntry call.  It
  // contains no parameters.
  EVENT_TYPE(SIMPLE_CACHE_ENTRY_CLOSE_END)
  
  // This event is created (in a source of the same name) when the internal DNS
  // resolver creates a UDP socket to check for global IPv6 connectivity.
  EVENT_TYPE(IPV6_REACHABILITY_CHECK)
  