Fork cc::OutputSurface into cc::CompositorFrameSink.

cc/trees/channel_impl.h

Index: cc/trees/channel_impl.h
diff --git a/cc/trees/channel_impl.h b/cc/trees/channel_impl.h
index d8c8d3900326e4c2bc92b787f1bb480d96de9f12..aec9b4a6d6155e7994b41f78a1315a6efced41e0 100644
--- a/cc/trees/channel_impl.h
+++ b/cc/trees/channel_impl.h
@@ -23,9 +23,9 @@ class CC_EXPORT ChannelImpl {
   virtual void BeginMainFrameNotExpectedSoon() = 0;
   virtual void DidCommitAndDrawFrame() = 0;
   virtual void SetAnimationEvents(std::unique_ptr<AnimationEvents> queue) = 0;
-  virtual void DidLoseOutputSurface() = 0;
-  virtual void RequestNewOutputSurface() = 0;
-  virtual void DidInitializeOutputSurface(bool success) = 0;
+  virtual void DidLoseCompositorFrameSink() = 0;
+  virtual void RequestNewCompositorFrameSink() = 0;
+  virtual void DidInitializeCompositorFrameSink(bool success) = 0;
   virtual void DidCompletePageScaleAnimation() = 0;
   virtual void BeginMainFrame(
       std::unique_ptr<BeginMainFrameAndCommitState> begin_main_frame_state) = 0;