Continuously request keyframes if decoding does not recover.

video/video_receive_stream.h

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 137 matching lines @@
   std::unique_ptr<RtpStreamReceiverInterface> media_receiver_;
   std::unique_ptr<RtxReceiveStream> rtx_receive_stream_;
   std::unique_ptr<RtpStreamReceiverInterface> rtx_receiver_;
 
   // Whenever we are in an undecodable state (stream has just started or due to
   // a decoding error) we require a keyframe to restart the stream.
   bool keyframe_required_ = true;
 
   // If we have successfully decoded any frame.
   bool frame_decoded_ = false;
+
+  int64_t last_keyframe_request_ms_ = 0;
 };
 }  // namespace internal
 }  // namespace webrtc
 
 #endif  // VIDEO_VIDEO_RECEIVE_STREAM_H_