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

media/video/capture/fake_video_capture_device_unittest.cc

Index: media/video/capture/fake_video_capture_device_unittest.cc
diff --git a/media/video/capture/fake_video_capture_device_unittest.cc b/media/video/capture/fake_video_capture_device_unittest.cc
index ace1a28a47c83f494a17d2392b4eddf3df2b9c98..3ad349f4f49bd16f73d7efbe9fd37cef37504012 100644
--- a/media/video/capture/fake_video_capture_device_unittest.cc
+++ b/media/video/capture/fake_video_capture_device_unittest.cc
@@ -26,9 +26,8 @@ class MockClient : public VideoCaptureDevice::Client {
   MOCK_METHOD2(ReserveOutputBuffer,
                scoped_refptr<Buffer>(VideoFrame::Format format,
                                      const gfx::Size& dimensions));
-  MOCK_METHOD4(OnIncomingCapturedVideoFrame,
+  MOCK_METHOD3(OnIncomingCapturedVideoFrame,
                void(const scoped_refptr<Buffer>& buffer,
-                    const VideoCaptureFormat& buffer_format,
                     const scoped_refptr<media::VideoFrame>& frame,
                     const base::TimeTicks& timestamp));
   MOCK_METHOD1(OnError, void(const std::string& reason));
@@ -82,7 +81,7 @@ class FakeVideoCaptureDeviceTest : public testing::Test {
 
   void SetUp() override {
     EXPECT_CALL(*client_, ReserveOutputBuffer(_,_)).Times(0);
-    EXPECT_CALL(*client_, OnIncomingCapturedVideoFrame(_,_,_,_)).Times(0);
+    EXPECT_CALL(*client_, OnIncomingCapturedVideoFrame(_,_,_)).Times(0);
   }
 
   void OnFrameCaptured(const VideoCaptureFormat& format) {