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

webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc

 /*
  *  Copyright (c) 2016 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/media/engine/videodecodersoftwarefallbackwrapper.h"
 
 #include <string>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
+#include "webrtc/base/trace_event.h"
 #include "webrtc/media/engine/internaldecoderfactory.h"
 #include "webrtc/modules/video_coding/include/video_error_codes.h"
 
 namespace webrtc {
 
 VideoDecoderSoftwareFallbackWrapper::VideoDecoderSoftwareFallbackWrapper(
     VideoCodecType codec_type,
     VideoDecoder* decoder)
     : codec_type_(codec_type),
       decoder_(decoder),
@@ skipping 41 matching lines @@
       " (fallback from: " + decoder_->ImplementationName() + ")";
   return true;
 }
 
 int32_t VideoDecoderSoftwareFallbackWrapper::Decode(
     const EncodedImage& input_image,
     bool missing_frames,
     const RTPFragmentationHeader* fragmentation,
     const CodecSpecificInfo* codec_specific_info,
     int64_t render_time_ms) {
+    TRACE_EVENT0("webrtc", "VideoDecoderSoftwareFallbackWrapper::Decode");
   // Try initializing and decoding with the provided decoder on every keyframe
   // or when there's no fallback decoder. This is the normal case.
   if (!fallback_decoder_ || input_image._frameType == kVideoFrameKey) {
     int32_t ret = WEBRTC_VIDEO_CODEC_FALLBACK_SOFTWARE;
     // Try reinitializing the decoder if it had failed before.
     if (!decoder_initialized_) {
       decoder_initialized_ =
           decoder_->InitDecode(&codec_settings_, number_of_cores_) ==
           WEBRTC_VIDEO_CODEC_OK;
     }
@@ skipping 48 matching lines @@
   return decoder_->PrefersLateDecoding();
 }
 
 const char* VideoDecoderSoftwareFallbackWrapper::ImplementationName() const {
   if (fallback_decoder_)
     return fallback_implementation_name_.c_str();
   return decoder_->ImplementationName();
 }
 
 }  // namespace webrtc