Add cricket::VideoFrame::frame_id() and set it to RTP timestamp.

webrtc/media/base/videoframe.h

 /*
  *  Copyright (c) 2004 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 20 matching lines @@
   // Basic accessors.
   // Note this is the width and height without rotation applied.
   virtual int width() const = 0;
   virtual int height() const = 0;
 
   // Returns the underlying video frame buffer. This function is ok to call
   // multiple times, but the returned object will refer to the same memory.
   virtual const rtc::scoped_refptr<webrtc::VideoFrameBuffer>&
   video_frame_buffer() const = 0;
 
+  // Frame ID. Normally RTP timestamp when the frame was received using RTP.
+  virtual uint32_t transport_frame_id() const = 0;
+
   // System monotonic clock, same timebase as rtc::TimeMicros().
   virtual int64_t timestamp_us() const = 0;
   virtual void set_timestamp_us(int64_t time_us) = 0;
 
   // Deprecated methods, for backwards compatibility.
   // TODO(nisse): Delete when usage in Chrome and other applications
   // have been replaced.
   virtual int64_t GetTimeStamp() const {
     return rtc::kNumNanosecsPerMicrosec * timestamp_us();
   }
@@ skipping 44 matching lines @@
   static bool Validate(uint32_t fourcc,
                        int w,
                        int h,
                        const uint8_t* sample,
                        size_t sample_size);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_VIDEOFRAME_H_