Add trace around color conversion (VideoCaptureController::OnIncomingCapturedFrame).

content/browser/renderer_host/media/video_capture_controller.cc

 // 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.
 
 #include "content/browser/renderer_host/media/video_capture_controller.h"
 
 #include <set>
 
 #include "base/bind.h"
+#include "base/debug/trace_event.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/media/video_capture_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_util.h"
 #include "media/base/yuv_convert.h"
 
 #if !defined(OS_IOS) && !defined(OS_ANDROID)
@@ skipping 241 matching lines @@
     const uint8* data,
     int length,
     base::Time timestamp,
     int rotation,
     bool flip_vert,
     bool flip_horiz) {
   DCHECK(frame_info_.color == media::VideoCaptureCapability::kI420 ||
          frame_info_.color == media::VideoCaptureCapability::kYV12 ||
          (rotation == 0 && !flip_vert && !flip_horiz));
 
+  TRACE_EVENT0("video", "VideoCaptureController::OnIncomingCapturedFrame");
+
   scoped_refptr<media::VideoFrame> dst;
   {
     base::AutoLock lock(buffer_pool_lock_);
     if (!buffer_pool_.get())
       return;
     dst = buffer_pool_->ReserveI420VideoFrame(gfx::Size(frame_info_.width,
                                                         frame_info_.height),
                                               rotation);
   }
 
@@ skipping 445 matching lines @@
     controller_clients_.push_back((*client_it));
     pending_clients_.erase(client_it++);
   }
   // Request the manager to start the actual capture.
   video_capture_manager_->Start(current_params_, this);
   state_ = VIDEO_CAPTURE_STATE_STARTED;
   device_in_use_ = true;
 }
 
 }  // namespace content