Fix failed capture handling in WebrtcVideoStream

remoting/protocol/webrtc_frame_scheduler_simple.h

 // Copyright 2016 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_FRAME_SCHEDULER_SIMPLE_H_
 #define REMOTING_PROTOCOL_WEBRTC_FRAME_SCHEDULER_SIMPLE_H_
 
 #include "remoting/protocol/webrtc_frame_scheduler.h"
 
 #include <queue>
@@ skipping 50 matching lines @@
 
     int minimum_bitrate_ = 0;
     int current_target_bitrate_ = 0;
   };
 
   void ScheduleNextFrame(base::TimeTicks now);
   void CaptureNextFrame();
 
   base::Closure capture_callback_;
   bool paused_ = false;
+
+  // Set to false until the first frame frame was captured successfully.
+  bool captured_first_frame_ = false;
+
+  // Set to true when a key frame was requested.
   bool key_frame_request_ = false;
 
   base::TimeTicks last_capture_started_time_;
 
   LeakyBucket pacing_bucket_;
 
   EncoderBitrateFilter encoder_bitrate_;
 
   // Set to true when a frame is being captured or encoded.
   bool frame_pending_ = false;
@@ skipping 12 matching lines @@
   base::OneShotTimer capture_timer_;
 
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<WebrtcFrameSchedulerSimple> weak_factory_;
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_WEBRTC_FRAME_SCHEDULER_SIMPLE_H_