cc: Add testing stubs for proxy test

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 380cc95f1989d3570060328b6d0b30a01e2569a6..127630aa7865b8eb58569e549194b3348fc41656 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -304,7 +304,7 @@ class CC_EXPORT LayerTreeHost {
   LayerTreeHost(LayerTreeHostClient* client,
                 SharedBitmapManager* manager,
                 const LayerTreeSettings& settings);
-  void InitializeThreaded(
+  virtual void InitializeThreaded(

[brianderson, 2014/05/14 21:12:07]

Instead of overriding this method, could we re-use the LayerTreeHostWithProxy
pattern in layer_tree_host_unittest.cc?

[simonhong, 2014/05/15 01:32:07]

Done.

       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
   void InitializeSingleThreaded(
       LayerTreeHostSingleThreadClient* single_thread_client);
@@ -312,12 +312,11 @@ class CC_EXPORT LayerTreeHost {
   void SetOutputSurfaceLostForTesting(bool is_lost) {
     output_surface_lost_ = is_lost;
   }
+  void InitializeProxy(scoped_ptr<Proxy> proxy);

[brianderson, 2014/05/14 21:12:07]

This could stay private. There's an existing
LayerTreeHost::InitializeForTesting.

[simonhong, 2014/05/15 01:32:07]

Ah, I didn't find it.
Thanks. Restored.

 
   MicroBenchmarkController micro_benchmark_controller_;
 
  private:
-  void InitializeProxy(scoped_ptr<Proxy> proxy);
-
   void PaintLayerContents(
       const RenderSurfaceLayerList& render_surface_layer_list,
       ResourceUpdateQueue* queue,