Add performance tracing for PlatformThread and parts of the video code.

webrtc/common_video/incoming_video_stream.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/common_video/include/incoming_video_stream.h"
 
 #include <memory>
 
 #include "webrtc/base/timeutils.h"
+#include "webrtc/base/trace_event.h"
 #include "webrtc/common_video/video_render_frames.h"
 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/include/event_wrapper.h"
 
 namespace webrtc {
 namespace {
 const char kIncomingQueueName[] = "IncomingVideoStream";
 }
 
 // Capture by moving (std::move) into a lambda isn't possible in C++11
@@ skipping 27 matching lines @@
     : render_buffers_(delay_ms),
       callback_(callback),
       incoming_render_queue_(kIncomingQueueName,
                              rtc::TaskQueue::Priority::HIGH) {}
 
 IncomingVideoStream::~IncomingVideoStream() {
   RTC_DCHECK(main_thread_checker_.CalledOnValidThread());
 }
 
 void IncomingVideoStream::OnFrame(const VideoFrame& video_frame) {
+  TRACE_EVENT0("webrtc", "IncomingVideoStream::OnFrame");
   RTC_CHECK_RUNS_SERIALIZED(&decoder_race_checker_);
   RTC_DCHECK(!incoming_render_queue_.IsCurrent());
   incoming_render_queue_.PostTask(
       std::unique_ptr<rtc::QueuedTask>(new NewFrameTask(this, video_frame)));
 }
 
 void IncomingVideoStream::Dequeue() {
+  TRACE_EVENT0("webrtc", "IncomingVideoStream::Dequeue");
   RTC_DCHECK(incoming_render_queue_.IsCurrent());
   rtc::Optional<VideoFrame> frame_to_render = render_buffers_.FrameToRender();
   if (frame_to_render)
     callback_->OnFrame(*frame_to_render);
 
   if (render_buffers_.HasPendingFrames()) {
     uint32_t wait_time = render_buffers_.TimeToNextFrameRelease();
     incoming_render_queue_.PostDelayedTask([this]() { Dequeue(); }, wait_time);
   }
 }
 
 }  // namespace webrtc