Split ThreadProxy methods to ProxyMain and ProxyImpl.

cc/trees/channel_main.h

Index: cc/trees/channel_main.h
diff --git a/cc/trees/channel_main.h b/cc/trees/channel_main.h
index c4cdcc632d8a2be06133c95882afa4b162ed7405..6a687b3287a00c0a96864142b3e8b5d6ea982906 100644
--- a/cc/trees/channel_main.h
+++ b/cc/trees/channel_main.h
@@ -6,9 +6,10 @@
 #define CC_TREES_CHANNEL_MAIN_H_
 
 #include "cc/base/cc_export.h"
+#include "cc/base/completion_event.h"
+#include "cc/output/output_surface.h"
 
 namespace cc {
-
 // ChannelMain and ChannelImpl provide an abstract communication layer for
 // the main and impl side of the compositor.
 //
@@ -23,6 +24,17 @@ class CC_EXPORT ChannelMain {
  public:
   // Interface for commands sent to the ProxyImpl
   virtual void SetThrottleFrameProductionOnImpl(bool throttle) = 0;
+  virtual void InitializeOutputSurfaceOnImpl(OutputSurface* output_surface) = 0;
+  virtual void MainThreadHasStoppedFlingingOnImpl() = 0;
+  virtual void SetInputThrottledUntilCommitOnImpl(bool is_throttled) = 0;
+  virtual void SetDeferCommitsOnImpl(bool defer_commits) = 0;
+  virtual void FinishAllRenderingOnImpl(CompletionEvent* completion) = 0;
+  virtual void SetVisibleOnImpl(CompletionEvent* completion, bool visible) = 0;
+  virtual void ReleaseOutputSurfaceOnImpl(CompletionEvent* completion) = 0;
+  virtual void FinishGLOnImpl(CompletionEvent* completion) = 0;
+  virtual void MainFrameWillHappenOnImplForTesting(
+      CompletionEvent* completion,
+      bool* main_frame_will_happen) = 0;
 
   virtual ~ChannelMain() {}
 };