Rework PerformanceTracker to make it usable with WebRTC

remoting/protocol/webrtc_video_renderer_adapter.h

 // Copyright 2015 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.
 
 #ifndef REMOTING_PROTOCOL_WEBRTC_VIDEO_RENDERER_ADAPTER_H_
 #define REMOTING_PROTOCOL_WEBRTC_VIDEO_RENDERER_ADAPTER_H_
 
 #include <memory>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "third_party/webrtc/api/mediastreaminterface.h"
 #include "third_party/webrtc/media/base/videosinkinterface.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace webrtc {
 class DesktopFrame;
 class VideoFrameBuffer;
 }  // namespace webrtc
 
 namespace remoting {
 namespace protocol {
 
 class FrameConsumer;
+struct FrameStats;
 
 class WebrtcVideoRendererAdapter
     : public rtc::VideoSinkInterface<cricket::VideoFrame> {
  public:
   WebrtcVideoRendererAdapter(
       scoped_refptr<webrtc::MediaStreamInterface> media_stream,
       FrameConsumer* frame_consumer);
   ~WebrtcVideoRendererAdapter() override;
 
   std::string label() const { return media_stream_->label(); }
 
   // rtc::VideoSinkInterface implementation.
   void OnFrame(const cricket::VideoFrame& frame) override;
 
  private:
-  void HandleFrameOnMainThread(scoped_refptr<webrtc::VideoFrameBuffer> frame);
-  void DrawFrame(std::unique_ptr<webrtc::DesktopFrame> frame);
+  void HandleFrameOnMainThread(std::unique_ptr<FrameStats> stats,
+                               scoped_refptr<webrtc::VideoFrameBuffer> frame);
+  void DrawFrame(std::unique_ptr<FrameStats> stats,
+                 std::unique_ptr<webrtc::DesktopFrame> frame);
+  void FrameRendered(std::unique_ptr<FrameStats> stats);
 
   scoped_refptr<webrtc::MediaStreamInterface> media_stream_;
   FrameConsumer* frame_consumer_;
   uint32_t output_format_fourcc_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   base::WeakPtrFactory<WebrtcVideoRendererAdapter> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebrtcVideoRendererAdapter);
 };
 
 }  // namespace remoting
 }  // namespace protocol
 
 #endif  // REMOTING_PROTOCOL_WEBRTC_VIDEO_RENDERER_ADAPTER_H_