Fix failed capture handling in WebrtcVideoStream

remoting/protocol/webrtc_frame_scheduler_simple.h

Index: remoting/protocol/webrtc_frame_scheduler_simple.h
diff --git a/remoting/protocol/webrtc_frame_scheduler_simple.h b/remoting/protocol/webrtc_frame_scheduler_simple.h
index cd5f4dd5d2eb5823002c81a421a746a8f18abeaf..4e465021837a5e651c40b6df38e5e6f2a6301875 100644
--- a/remoting/protocol/webrtc_frame_scheduler_simple.h
+++ b/remoting/protocol/webrtc_frame_scheduler_simple.h
@@ -68,6 +68,11 @@ class WebrtcFrameSchedulerSimple : public VideoChannelStateObserver,
 
   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_;