We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
secure_authorized_channel should pass **kwargs to grpc.secure_channel
This will enable us to completely replace google-cloud-python's [similar function](https://github.com/GoogleCloudPlatform/google-cloud-python/blob/115748814bf6a59d99c13e070dfdcfbdec5e865d/core/google/cloud/_helpers.py#L659)

/cc @dhermes 

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `google/auth/transport/grpc.py`
Content:
```
1 # Copyright 2016 Google Inc.
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
6 #
7 #      http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 
15 """Authorization support for gRPC."""
16 
17 from __future__ import absolute_import
18 
19 import grpc
20 
21 
22 class AuthMetadataPlugin(grpc.AuthMetadataPlugin):
23     """A `gRPC AuthMetadataPlugin`_ that inserts the credentials into each
24     request.
25 
26     .. _gRPC AuthMetadataPlugin:
27         http://www.grpc.io/grpc/python/grpc.html#grpc.AuthMetadataPlugin
28 
29     Args:
30         credentials (google.auth.credentials.Credentials): The credentials to
31             add to requests.
32         request (google.auth.transport.Request): A HTTP transport request
33             object used to refresh credentials as needed.
34     """
35     def __init__(self, credentials, request):
36         self._credentials = credentials
37         self._request = request
38 
39     def _get_authorization_headers(self):
40         """Gets the authorization headers for a request.
41 
42         Returns:
43             Sequence[Tuple[str, str]]: A list of request headers (key, value)
44                 to add to the request.
45         """
46         if self._credentials.expired or not self._credentials.valid:
47             self._credentials.refresh(self._request)
48 
49         return [
50             ('authorization', 'Bearer {}'.format(self._credentials.token))
51         ]
52 
53     def __call__(self, context, callback):
54         """Passes authorization metadata into the given callback.
55 
56         Args:
57             context (grpc.AuthMetadataContext): The RPC context.
58             callback (grpc.AuthMetadataPluginCallback): The callback that will
59                 be invoked to pass in the authorization metadata.
60         """
61         callback(self._get_authorization_headers(), None)
62 
63 
64 def secure_authorized_channel(
65         credentials, request, target, ssl_credentials=None):
66     """Creates a secure authorized gRPC channel.
67 
68     This creates a channel with SSL and :class:`AuthMetadataPlugin`. This
69     channel can be used to create a stub that can make authorized requests.
70 
71     Example::
72 
73         import google.auth
74         import google.auth.transport.grpc
75         import google.auth.transport.requests
76         from google.cloud.speech.v1 import cloud_speech_pb2
77 
78         # Get credentials.
79         credentials, _ = google.auth.default()
80 
81         # Get an HTTP request function to refresh credentials.
82         request = google.auth.transport.requests.Request()
83 
84         # Create a channel.
85         channel = google.auth.transport.grpc.secure_authorized_channel(
86             credentials, 'speech.googleapis.com:443', request)
87 
88         # Use the channel to create a stub.
89         cloud_speech.create_Speech_stub(channel)
90 
91     Args:
92         credentials (google.auth.credentials.Credentials): The credentials to
93             add to requests.
94         request (google.auth.transport.Request): A HTTP transport request
95             object used to refresh credentials as needed. Even though gRPC
96             is a separate transport, there's no way to refresh the credentials
97             without using a standard http transport.
98         target (str): The host and port of the service.
99         ssl_credentials (grpc.ChannelCredentials): Optional SSL channel
100             credentials. This can be used to specify different certificates.
101 
102     Returns:
103         grpc.Channel: The created gRPC channel.
104     """
105     # Create the metadata plugin for inserting the authorization header.
106     metadata_plugin = AuthMetadataPlugin(credentials, request)
107 
108     # Create a set of grpc.CallCredentials using the metadata plugin.
109     google_auth_credentials = grpc.metadata_call_credentials(metadata_plugin)
110 
111     if ssl_credentials is None:
112         ssl_credentials = grpc.ssl_channel_credentials()
113 
114     # Combine the ssl credentials and the authorization credentials.
115     composite_credentials = grpc.composite_channel_credentials(
116         ssl_credentials, google_auth_credentials)
117 
118     return grpc.secure_channel(target, composite_credentials)
119
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/google/auth/transport/grpc.py b/google/auth/transport/grpc.py
--- a/google/auth/transport/grpc.py
+++ b/google/auth/transport/grpc.py
@@ -62,7 +62,7 @@
 
 
 def secure_authorized_channel(
-        credentials, request, target, ssl_credentials=None):
+        credentials, request, target, ssl_credentials=None, **kwargs):
     """Creates a secure authorized gRPC channel.
 
     This creates a channel with SSL and :class:`AuthMetadataPlugin`. This
@@ -98,6 +98,7 @@
         target (str): The host and port of the service.
         ssl_credentials (grpc.ChannelCredentials): Optional SSL channel
             credentials. This can be used to specify different certificates.
+        kwargs: Additional arguments to pass to :func:`grpc.secure_channel`.
 
     Returns:
         grpc.Channel: The created gRPC channel.
@@ -115,4 +116,4 @@
     composite_credentials = grpc.composite_channel_credentials(
         ssl_credentials, google_auth_credentials)
 
-    return grpc.secure_channel(target, composite_credentials)
+    return grpc.secure_channel(target, composite_credentials, **kwargs)

{"golden_diff": "diff --git a/google/auth/transport/grpc.py b/google/auth/transport/grpc.py\n--- a/google/auth/transport/grpc.py\n+++ b/google/auth/transport/grpc.py\n@@ -62,7 +62,7 @@\n \n \n def secure_authorized_channel(\n-        credentials, request, target, ssl_credentials=None):\n+        credentials, request, target, ssl_credentials=None, **kwargs):\n     \"\"\"Creates a secure authorized gRPC channel.\n \n     This creates a channel with SSL and :class:`AuthMetadataPlugin`. This\n@@ -98,6 +98,7 @@\n         target (str): The host and port of the service.\n         ssl_credentials (grpc.ChannelCredentials): Optional SSL channel\n             credentials. This can be used to specify different certificates.\n+        kwargs: Additional arguments to pass to :func:`grpc.secure_channel`.\n \n     Returns:\n         grpc.Channel: The created gRPC channel.\n@@ -115,4 +116,4 @@\n     composite_credentials = grpc.composite_channel_credentials(\n         ssl_credentials, google_auth_credentials)\n \n-    return grpc.secure_channel(target, composite_credentials)\n+    return grpc.secure_channel(target, composite_credentials, **kwargs)\n", "issue": "secure_authorized_channel should pass **kwargs to grpc.secure_channel\nThis will enable us to completely replace google-cloud-python's [similar function](https://github.com/GoogleCloudPlatform/google-cloud-python/blob/115748814bf6a59d99c13e070dfdcfbdec5e865d/core/google/cloud/_helpers.py#L659)\r\n\r\n/cc @dhermes \n", "before_files": [{"content": "# Copyright 2016 Google Inc.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#      http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\n\"\"\"Authorization support for gRPC.\"\"\"\n\nfrom __future__ import absolute_import\n\nimport grpc\n\n\nclass AuthMetadataPlugin(grpc.AuthMetadataPlugin):\n    \"\"\"A `gRPC AuthMetadataPlugin`_ that inserts the credentials into each\n    request.\n\n    .. _gRPC AuthMetadataPlugin:\n        http://www.grpc.io/grpc/python/grpc.html#grpc.AuthMetadataPlugin\n\n    Args:\n        credentials (google.auth.credentials.Credentials): The credentials to\n            add to requests.\n        request (google.auth.transport.Request): A HTTP transport request\n            object used to refresh credentials as needed.\n    \"\"\"\n    def __init__(self, credentials, request):\n        self._credentials = credentials\n        self._request = request\n\n    def _get_authorization_headers(self):\n        \"\"\"Gets the authorization headers for a request.\n\n        Returns:\n            Sequence[Tuple[str, str]]: A list of request headers (key, value)\n                to add to the request.\n        \"\"\"\n        if self._credentials.expired or not self._credentials.valid:\n            self._credentials.refresh(self._request)\n\n        return [\n            ('authorization', 'Bearer {}'.format(self._credentials.token))\n        ]\n\n    def __call__(self, context, callback):\n        \"\"\"Passes authorization metadata into the given callback.\n\n        Args:\n            context (grpc.AuthMetadataContext): The RPC context.\n            callback (grpc.AuthMetadataPluginCallback): The callback that will\n                be invoked to pass in the authorization metadata.\n        \"\"\"\n        callback(self._get_authorization_headers(), None)\n\n\ndef secure_authorized_channel(\n        credentials, request, target, ssl_credentials=None):\n    \"\"\"Creates a secure authorized gRPC channel.\n\n    This creates a channel with SSL and :class:`AuthMetadataPlugin`. This\n    channel can be used to create a stub that can make authorized requests.\n\n    Example::\n\n        import google.auth\n        import google.auth.transport.grpc\n        import google.auth.transport.requests\n        from google.cloud.speech.v1 import cloud_speech_pb2\n\n        # Get credentials.\n        credentials, _ = google.auth.default()\n\n        # Get an HTTP request function to refresh credentials.\n        request = google.auth.transport.requests.Request()\n\n        # Create a channel.\n        channel = google.auth.transport.grpc.secure_authorized_channel(\n            credentials, 'speech.googleapis.com:443', request)\n\n        # Use the channel to create a stub.\n        cloud_speech.create_Speech_stub(channel)\n\n    Args:\n        credentials (google.auth.credentials.Credentials): The credentials to\n            add to requests.\n        request (google.auth.transport.Request): A HTTP transport request\n            object used to refresh credentials as needed. Even though gRPC\n            is a separate transport, there's no way to refresh the credentials\n            without using a standard http transport.\n        target (str): The host and port of the service.\n        ssl_credentials (grpc.ChannelCredentials): Optional SSL channel\n            credentials. This can be used to specify different certificates.\n\n    Returns:\n        grpc.Channel: The created gRPC channel.\n    \"\"\"\n    # Create the metadata plugin for inserting the authorization header.\n    metadata_plugin = AuthMetadataPlugin(credentials, request)\n\n    # Create a set of grpc.CallCredentials using the metadata plugin.\n    google_auth_credentials = grpc.metadata_call_credentials(metadata_plugin)\n\n    if ssl_credentials is None:\n        ssl_credentials = grpc.ssl_channel_credentials()\n\n    # Combine the ssl credentials and the authorization credentials.\n    composite_credentials = grpc.composite_channel_credentials(\n        ssl_credentials, google_auth_credentials)\n\n    return grpc.secure_channel(target, composite_credentials)\n", "path": "google/auth/transport/grpc.py"}], "after_files": [{"content": "# Copyright 2016 Google Inc.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#      http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\n\"\"\"Authorization support for gRPC.\"\"\"\n\nfrom __future__ import absolute_import\n\nimport grpc\n\n\nclass AuthMetadataPlugin(grpc.AuthMetadataPlugin):\n    \"\"\"A `gRPC AuthMetadataPlugin`_ that inserts the credentials into each\n    request.\n\n    .. _gRPC AuthMetadataPlugin:\n        http://www.grpc.io/grpc/python/grpc.html#grpc.AuthMetadataPlugin\n\n    Args:\n        credentials (google.auth.credentials.Credentials): The credentials to\n            add to requests.\n        request (google.auth.transport.Request): A HTTP transport request\n            object used to refresh credentials as needed.\n    \"\"\"\n    def __init__(self, credentials, request):\n        self._credentials = credentials\n        self._request = request\n\n    def _get_authorization_headers(self):\n        \"\"\"Gets the authorization headers for a request.\n\n        Returns:\n            Sequence[Tuple[str, str]]: A list of request headers (key, value)\n                to add to the request.\n        \"\"\"\n        if self._credentials.expired or not self._credentials.valid:\n            self._credentials.refresh(self._request)\n\n        return [\n            ('authorization', 'Bearer {}'.format(self._credentials.token))\n        ]\n\n    def __call__(self, context, callback):\n        \"\"\"Passes authorization metadata into the given callback.\n\n        Args:\n            context (grpc.AuthMetadataContext): The RPC context.\n            callback (grpc.AuthMetadataPluginCallback): The callback that will\n                be invoked to pass in the authorization metadata.\n        \"\"\"\n        callback(self._get_authorization_headers(), None)\n\n\ndef secure_authorized_channel(\n        credentials, request, target, ssl_credentials=None, **kwargs):\n    \"\"\"Creates a secure authorized gRPC channel.\n\n    This creates a channel with SSL and :class:`AuthMetadataPlugin`. This\n    channel can be used to create a stub that can make authorized requests.\n\n    Example::\n\n        import google.auth\n        import google.auth.transport.grpc\n        import google.auth.transport.requests\n        from google.cloud.speech.v1 import cloud_speech_pb2\n\n        # Get credentials.\n        credentials, _ = google.auth.default()\n\n        # Get an HTTP request function to refresh credentials.\n        request = google.auth.transport.requests.Request()\n\n        # Create a channel.\n        channel = google.auth.transport.grpc.secure_authorized_channel(\n            credentials, 'speech.googleapis.com:443', request)\n\n        # Use the channel to create a stub.\n        cloud_speech.create_Speech_stub(channel)\n\n    Args:\n        credentials (google.auth.credentials.Credentials): The credentials to\n            add to requests.\n        request (google.auth.transport.Request): A HTTP transport request\n            object used to refresh credentials as needed. Even though gRPC\n            is a separate transport, there's no way to refresh the credentials\n            without using a standard http transport.\n        target (str): The host and port of the service.\n        ssl_credentials (grpc.ChannelCredentials): Optional SSL channel\n            credentials. This can be used to specify different certificates.\n        kwargs: Additional arguments to pass to :func:`grpc.secure_channel`.\n\n    Returns:\n        grpc.Channel: The created gRPC channel.\n    \"\"\"\n    # Create the metadata plugin for inserting the authorization header.\n    metadata_plugin = AuthMetadataPlugin(credentials, request)\n\n    # Create a set of grpc.CallCredentials using the metadata plugin.\n    google_auth_credentials = grpc.metadata_call_credentials(metadata_plugin)\n\n    if ssl_credentials is None:\n        ssl_credentials = grpc.ssl_channel_credentials()\n\n    # Combine the ssl credentials and the authorization credentials.\n    composite_credentials = grpc.composite_channel_credentials(\n        ssl_credentials, google_auth_credentials)\n\n    return grpc.secure_channel(target, composite_credentials, **kwargs)\n", "path": "google/auth/transport/grpc.py"}]}