Add InputEventTimestampSource interface.

remoting/protocol/webrtc_video_stream.h

Index: remoting/protocol/webrtc_video_stream.h
diff --git a/remoting/protocol/webrtc_video_stream.h b/remoting/protocol/webrtc_video_stream.h
index fc0177083330d8eb128c276bcd855807d886dd1c..9b4623d030e3590bf7180da88a1e3498a55ecdba 100644
--- a/remoting/protocol/webrtc_video_stream.h
+++ b/remoting/protocol/webrtc_video_stream.h
@@ -46,8 +46,9 @@ class WebrtcVideoStream : public VideoStream,
              scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner);
 
   // VideoStream interface.
+  void SetEventTimestampSource(
+      scoped_refptr<InputEventTimestampSource> event_timestamp_source) override;
   void Pause(bool pause) override;
-  void OnInputEventReceived(int64_t event_timestamp) override;
   void SetLosslessEncode(bool want_lossless) override;
   void SetLosslessColor(bool want_lossless) override;
   void SetObserver(Observer* observer) override;
@@ -87,14 +88,13 @@ class WebrtcVideoStream : public VideoStream,
   // Used to encode captured frames. Always accessed on the encode thread.
   std::unique_ptr<WebrtcVideoEncoder> encoder_;
 
+  scoped_refptr<InputEventTimestampSource> event_timestamp_source_;
+
   scoped_refptr<webrtc::PeerConnectionInterface> peer_connection_;
   scoped_refptr<webrtc::MediaStreamInterface> stream_;
 
   HostVideoStatsDispatcher video_stats_dispatcher_;
 
-  // Timestamps for the frame to be captured next.
-  std::unique_ptr<FrameTimestamps> next_frame_timestamps_;
-
   // Timestamps for the frame that's being captured.
   std::unique_ptr<FrameTimestamps> captured_frame_timestamps_;