text: // Copyright 2019 The Dawn Authors
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #ifndef SRC_DAWN_PLATFORM_TRACING_EVENTTRACER_H_
  #define SRC_DAWN_PLATFORM_TRACING_EVENTTRACER_H_
  
  #include <cstdint>
  
  #include "dawn/platform/dawn_platform_export.h"
  
  namespace dawn::platform {
  
  class Platform;
  enum class TraceCategory;
  
  namespace tracing {
  
  using TraceEventHandle = uint64_t;
  
  DAWN_PLATFORM_EXPORT const unsigned char* GetTraceCategoryEnabledFlag(Platform* platform,
                                                                        TraceCategory category);
  
  // TODO(enga): Simplify this API.
  DAWN_PLATFORM_EXPORT TraceEventHandle AddTraceEvent(Platform* platform,
                                                      char phase,
                                                      const unsigned char* categoryGroupEnabled,
                                                      const char* name,
                                                      uint64_t id,
                                                      int numArgs,
                                                      const char** argNames,
                                                      const unsigned char* argTypes,
                                                      const uint64_t* argValues,
                                                      unsigned char flags);
  
  }  // namespace tracing
  }  // namespace dawn::platform
  
  #endif  // SRC_DAWN_PLATFORM_TRACING_EVENTTRACER_H_
  