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

content/renderer/media/video_capture_impl.h

Index: content/renderer/media/video_capture_impl.h
diff --git a/content/renderer/media/video_capture_impl.h b/content/renderer/media/video_capture_impl.h
index 86b1e4bd245e7b68e32d4adc3a9cd0d70926cc96..d7d6eb0791ed0364cac02bda567e4b4321dbbf1f 100644
--- a/content/renderer/media/video_capture_impl.h
+++ b/content/renderer/media/video_capture_impl.h
@@ -113,13 +113,15 @@ class CONTENT_EXPORT VideoCaptureImpl
                        int buffer_id) override;
   void OnBufferDestroyed(int buffer_id) override;
   void OnBufferReceived(int buffer_id,
-                        const media::VideoCaptureFormat& format,
+                        const gfx::Size& coded_size,
                         const gfx::Rect& visible_rect,
-                        base::TimeTicks) override;
+                        base::TimeTicks timestamp,
+                        const base::DictionaryValue& metadata) override;
   void OnMailboxBufferReceived(int buffer_id,
                                const gpu::MailboxHolder& mailbox_holder,
-                               const media::VideoCaptureFormat& format,
-                               base::TimeTicks timestamp) override;
+                               const gfx::Size& packed_frame_size,
+                               base::TimeTicks timestamp,
+                               const base::DictionaryValue& metadata) override;
   void OnStateChanged(VideoCaptureState state) override;
   void OnDeviceSupportedFormatsEnumerated(
       const media::VideoCaptureFormats& supported_formats) override;
@@ -165,9 +167,6 @@ class CONTENT_EXPORT VideoCaptureImpl
   // client to this class via StartCapture().
   media::VideoCaptureParams params_;
 
-  // The device's video capture format sent from browser process side.
-  media::VideoCaptureFormat last_frame_format_;
-
   // The device's first captured frame timestamp sent from browser process side.
   base::TimeTicks first_frame_timestamp_;