cc: Rename SwapBuffers on CompositorFrameSink to SubmitCompositorFrame

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index ccbd9e7393ee42373e8fea65dfebf6b39727e481..b947de444eba81b07ac536c37c2308da2526cf64 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -99,7 +99,7 @@ class LayerTreeHostImplClient {
  public:
   virtual void DidLoseCompositorFrameSinkOnImplThread() = 0;
   virtual void SetBeginFrameSource(BeginFrameSource* source) = 0;
-  virtual void DidSwapBuffersCompleteOnImplThread() = 0;
+  virtual void DidReceiveCompositorFrameAckOnImplThread() = 0;
   virtual void OnCanDrawStateChanged(bool can_draw) = 0;
   virtual void NotifyReadyToActivate() = 0;
   virtual void NotifyReadyToDraw() = 0;
@@ -302,6 +302,7 @@ class CC_EXPORT LayerTreeHostImpl
   // DidDrawAllLayers must also be called, regardless of whether DrawLayers is
   // called between the two.
   virtual DrawResult PrepareToDraw(FrameData* frame);
+  // TODO(danakj): This isn't "drawing" it's "generating a frame".

[sunnyps, 2016/10/11 18:32:48]

aside: I think it's OK for this to be called drawing. All "drawing" that happens
in Chrome is just about converting a set of high level primitives into a set of
low level primitives (e.g. layers to render passes, render passes to GL, etc.) 
so I'm not sure distinguishing between them is necessary. OTOH we use the word
"draw" to describe this everywhere throughout cc e.g. in the scheduler, in
CFS::OnDraw interface between webview and cc, etc. I'd rather not change all
these to SubmitCompositorFrame (or GenerateFrame or CompositeFrame).

[danakj, 2016/10/13 23:50:22]

Done.

   virtual bool DrawLayers(FrameData* frame);
   // Must be called if and only if PrepareToDraw was called.
   void DidDrawAllLayers(const FrameData& frame);
@@ -365,7 +366,7 @@ class CC_EXPORT LayerTreeHostImpl
       const gfx::Rect& viewport_rect,
       const gfx::Transform& transform) override;
   void DidLoseCompositorFrameSink() override;
-  void DidSwapBuffersComplete() override;
+  void DidReceiveCompositorFrameAck() override;
   void ReclaimResources(const ReturnedResourceArray& resources) override;
   void SetMemoryPolicy(const ManagedMemoryPolicy& policy) override;
   void SetTreeActivationCallback(const base::Closure& callback) override;