Add metadata to media::VideoFrame and plumb it through IPC/MediaStream.

content/renderer/media/video_track_adapter.cc

Index: content/renderer/media/video_track_adapter.cc
diff --git a/content/renderer/media/video_track_adapter.cc b/content/renderer/media/video_track_adapter.cc
index 855cf7674a643b902360a19f04d674c094f64236..d56e8d4f036b78c2b9f65576788402f83b5d6e16 100644
--- a/content/renderer/media/video_track_adapter.cc
+++ b/content/renderer/media/video_track_adapter.cc
@@ -76,7 +76,6 @@ class VideoTrackAdapter::VideoFrameResolutionAdapter
   void RemoveCallback(const MediaStreamVideoTrack* track);
 
   void DeliverFrame(const scoped_refptr<media::VideoFrame>& frame,
-                    const media::VideoCaptureFormat& format,
                     const base::TimeTicks& estimated_capture_time);
 
   // Returns true if all arguments match with the output of this adapter.
@@ -93,7 +92,6 @@ class VideoTrackAdapter::VideoFrameResolutionAdapter
 
   virtual void DoDeliverFrame(
       const scoped_refptr<media::VideoFrame>& frame,
-      const media::VideoCaptureFormat& format,
       const base::TimeTicks& estimated_capture_time);
 
   // Returns |true| if the input frame rate is higher that the requested max
@@ -174,17 +172,21 @@ VideoFrameResolutionAdapter::~VideoFrameResolutionAdapter() {
 
 void VideoTrackAdapter::VideoFrameResolutionAdapter::DeliverFrame(
     const scoped_refptr<media::VideoFrame>& frame,
-    const media::VideoCaptureFormat& format,
     const base::TimeTicks& estimated_capture_time) {
   DCHECK(io_thread_checker_.CalledOnValidThread());
 
-  if (MaybeDropFrame(frame, format.frame_rate))
+  double frame_rate;
+  if (!frame->metadata()->GetDouble(media::VideoFrameMetadata::FRAME_RATE,
+                                    &frame_rate)) {
+    frame_rate = MediaStreamVideoSource::kUnknownFrameRate;
+  }
+  if (MaybeDropFrame(frame, frame_rate))
     return;
 
   // TODO(perkj): Allow cropping / scaling of textures once
   // http://crbug/362521 is fixed.
   if (frame->format() == media::VideoFrame::NATIVE_TEXTURE) {
-    DoDeliverFrame(frame, format, estimated_capture_time);
+    DoDeliverFrame(frame, estimated_capture_time);
     return;
   }
   scoped_refptr<media::VideoFrame> video_frame(frame);
@@ -246,7 +248,7 @@ void VideoTrackAdapter::VideoFrameResolutionAdapter::DeliverFrame(
              << " output visible rect  "
              << video_frame->visible_rect().ToString();
   }
-  DoDeliverFrame(video_frame, format, estimated_capture_time);
+  DoDeliverFrame(video_frame, estimated_capture_time);
 }
 
 bool VideoTrackAdapter::VideoFrameResolutionAdapter::MaybeDropFrame(
@@ -311,13 +313,10 @@ bool VideoTrackAdapter::VideoFrameResolutionAdapter::MaybeDropFrame(
 void VideoTrackAdapter::
 VideoFrameResolutionAdapter::DoDeliverFrame(
     const scoped_refptr<media::VideoFrame>& frame,
-    const media::VideoCaptureFormat& format,
     const base::TimeTicks& estimated_capture_time) {
   DCHECK(io_thread_checker_.CalledOnValidThread());
-  for (std::vector<VideoIdCallbackPair>::const_iterator it = callbacks_.begin();
-       it != callbacks_.end(); ++it) {
-    it->second.Run(frame, format, estimated_capture_time);
-  }
+  for (const auto& entry : callbacks_)
+    entry.second.Run(frame, estimated_capture_time);
 }
 
 void VideoTrackAdapter::VideoFrameResolutionAdapter::AddCallback(
@@ -494,15 +493,12 @@ void VideoTrackAdapter::RemoveTrackOnIO(const MediaStreamVideoTrack* track) {
 
 void VideoTrackAdapter::DeliverFrameOnIO(
     const scoped_refptr<media::VideoFrame>& frame,
-    const media::VideoCaptureFormat& format,
     const base::TimeTicks& estimated_capture_time) {
   DCHECK(io_message_loop_->BelongsToCurrentThread());
   TRACE_EVENT0("video", "VideoTrackAdapter::DeliverFrameOnIO");
   ++frame_counter_;
-  for (FrameAdapters::iterator it = adapters_.begin();
-       it != adapters_.end(); ++it) {
-    (*it)->DeliverFrame(frame, format, estimated_capture_time);
-  }
+  for (const auto& adapter : adapters_)
+    adapter->DeliverFrame(frame, estimated_capture_time);
 }
 
 void VideoTrackAdapter::CheckFramesReceivedOnIO(