Fix WebrtcVideoStream to handle failed capture requests.

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 72 matching lines @@
   // Used to encode captured frames. Always accessed on the encode thread.
   std::unique_ptr<WebrtcVideoEncoder> encoder_;
 
   scoped_refptr<InputEventTimestampsSource> event_timestamps_source_;
 
   scoped_refptr<webrtc::PeerConnectionInterface> peer_connection_;
   scoped_refptr<webrtc::MediaStreamInterface> stream_;
 
   HostVideoStatsDispatcher video_stats_dispatcher_;
 
+  // In case when the capturer failed to capture a frame the corresponding event
+  // timestamps are saved in |next_frame_input_event_timestamps_| to be used for
+  // the following frame.
+  InputEventTimestamps next_frame_input_event_timestamps_;
+
   // Timestamps for the frame that's being captured.
   std::unique_ptr<FrameTimestamps> captured_frame_timestamps_;
 
   std::unique_ptr<WebrtcFrameScheduler> scheduler_;
 
   webrtc::DesktopSize frame_size_;
   webrtc::DesktopVector frame_dpi_;
   Observer* observer_ = nullptr;
 
   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_