Replace VideoStream::SizeCallback with VideoStream::Observer interface.

remoting/protocol/webrtc_video_stream.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_STREAM_H_
 #define REMOTING_PROTOCOL_WEBRTC_VIDEO_STREAM_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 31 matching lines @@
       std::unique_ptr<webrtc::DesktopCapturer> desktop_capturer,
       WebrtcTransport* webrtc_transport,
       scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner,
       std::unique_ptr<VideoEncoder> video_encoder);
 
   // VideoStream interface.
   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 SetSizeCallback(const SizeCallback& size_callback) override;
+  void SetObserver(Observer* observer) override;
 
  private:
   // webrtc::DesktopCapturer::Callback interface.
   void OnCaptureResult(webrtc::DesktopCapturer::Result result,
                        std::unique_ptr<webrtc::DesktopFrame> frame) override;
 
   // Starts |capture_timer_|.
   void StartCaptureTimer();
 
   // Called by |capture_timer_|.
@@ skipping 14 matching lines @@
   bool received_first_frame_request_ = false;
 
   bool capture_pending_ = false;
   bool encode_pending_ = false;
 
   // Last time capture was started.
   base::TimeTicks last_capture_started_ticks_;
 
   webrtc::DesktopSize frame_size_;
   webrtc::DesktopVector frame_dpi_;
-  SizeCallback size_callback_;
+  Observer* observer_ = nullptr;
 
   // Main task runner.
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
   // Task runner used to run |encoder_|.
   scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner_;
 
   // Capturer used to capture the screen.
   std::unique_ptr<webrtc::DesktopCapturer> capturer_;
 
   std::unique_ptr<base::RepeatingTimer> capture_timer_;
 
   // Used to send across encoded frames.
   WebrtcTransport* webrtc_transport_ = nullptr;
 
   // Used to encode captured frames. Always accessed on the encode thread.
   std::unique_ptr<VideoEncoder> encoder_;
 
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<WebrtcVideoStream> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebrtcVideoStream);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_WEBRTC_VIDEO_STREAM_H_