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

webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm

 /*
  *  Copyright 2015 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 18 matching lines @@
   void OnFrame(const cricket::VideoFrame& nativeVideoFrame) override {
     RTCVideoFrame *videoFrame = nil;
     // Rotation of native handles is unsupported right now. Convert to CPU
     // I420 buffer for rotation before calling the rotation method otherwise
     // it will hit a DCHECK.
     if (nativeVideoFrame.rotation() != webrtc::kVideoRotation_0 &&
         nativeVideoFrame.video_frame_buffer()->native_handle()) {
       rtc::scoped_refptr<webrtc::VideoFrameBuffer> i420Buffer =
           nativeVideoFrame.video_frame_buffer()->NativeToI420Buffer();
       std::unique_ptr<cricket::VideoFrame> cpuFrame(
-          new cricket::WebRtcVideoFrame(i420Buffer,
-                                        nativeVideoFrame.rotation(),
-                                        nativeVideoFrame.timestamp_us()));
+          new cricket::WebRtcVideoFrame(i420Buffer, nativeVideoFrame.rotation(),
+                                        nativeVideoFrame.timestamp_us(),
+                                        nativeVideoFrame.transport_frame_id()));
       const cricket::VideoFrame *rotatedFrame =
           cpuFrame->GetCopyWithRotationApplied();
       videoFrame = [[RTCVideoFrame alloc] initWithNativeFrame:rotatedFrame];
     } else {
       const cricket::VideoFrame *rotatedFrame =
           nativeVideoFrame.GetCopyWithRotationApplied();
       videoFrame = [[RTCVideoFrame alloc] initWithNativeFrame:rotatedFrame];
     }
     CGSize current_size = CGSizeMake(videoFrame.width, videoFrame.height);
     if (!CGSizeEqualToSize(size_, current_size)) {
@@ skipping 22 matching lines @@
     _adapter.reset(new webrtc::VideoRendererAdapter(self));
   }
   return self;
 }
 
 - (rtc::VideoSinkInterface<cricket::VideoFrame> *)nativeVideoRenderer {
   return _adapter.get();
 }
 
 @end