Revert of Add a flags field to video timing extension.

webrtc/common_video/video_frame.cc

 /*
  *  Copyright (c) 2012 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 31 matching lines @@
   return 0;
 }
 
 EncodedImage::EncodedImage() : EncodedImage(nullptr, 0, 0) {}
 
 EncodedImage::EncodedImage(uint8_t* buffer, size_t length, size_t size)
       : _buffer(buffer), _length(length), _size(size) {}
 
 void EncodedImage::SetEncodeTime(int64_t encode_start_ms,
                                 int64_t encode_finish_ms) const {
+    timing_.is_timing_frame = true;
     timing_.encode_start_ms = encode_start_ms;
     timing_.encode_finish_ms = encode_finish_ms;
 }
 }  // namespace webrtc