cc: Add support for sending BeginFrames for video.

cc/layers/video_frame_provider_client_impl.cc

Index: cc/layers/video_frame_provider_client_impl.cc
diff --git a/cc/layers/video_frame_provider_client_impl.cc b/cc/layers/video_frame_provider_client_impl.cc
index 339d4fcf847ff367b63daec742811b10011ae0ef..3ca39efda389cb4c2b00092b5872f3c8094d3524 100644
--- a/cc/layers/video_frame_provider_client_impl.cc
+++ b/cc/layers/video_frame_provider_client_impl.cc
@@ -13,13 +13,18 @@ namespace cc {
 
 // static
 scoped_refptr<VideoFrameProviderClientImpl>
-VideoFrameProviderClientImpl::Create(VideoFrameProvider* provider) {
-  return make_scoped_refptr(new VideoFrameProviderClientImpl(provider));
+VideoFrameProviderClientImpl::Create(VideoFrameProvider* provider,
+                                     VideoFrameControllerClient* client) {
+  return make_scoped_refptr(new VideoFrameProviderClientImpl(provider, client));
 }
 
 VideoFrameProviderClientImpl::VideoFrameProviderClientImpl(
-    VideoFrameProvider* provider)
-    : provider_(provider), active_video_layer_(nullptr), stopped_(false) {
+    VideoFrameProvider* provider,
+    VideoFrameControllerClient* client)
+    : provider_(provider),
+      client_(client),
+      active_video_layer_(nullptr),
+      stopped_(false) {
   // This only happens during a commit on the compositor thread while the main
   // thread is blocked. That makes this a thread-safe call to set the video
   // frame provider client that does not require a lock. The same is true of
@@ -59,6 +64,7 @@ void VideoFrameProviderClientImpl::Stop() {
     provider_->SetVideoFrameProviderClient(nullptr);
     provider_ = nullptr;
   }
+  client_->RemoveVideoFrameController(this);
   active_video_layer_ = nullptr;
   stopped_ = true;
 }
@@ -134,4 +140,9 @@ void VideoFrameProviderClientImpl::DidUpdateMatrix(const float* matrix) {
     active_video_layer_->SetNeedsRedraw();
 }
 
+void VideoFrameProviderClientImpl::OnBeginFrame(const BeginFrameArgs& args) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  NOTIMPLEMENTED();
+}
+
 }  // namespace cc