cc: Make separate interface for BeginFrame ipc from OutputSurface

cc/layers/layer_unittest.cc

Index: cc/layers/layer_unittest.cc
diff --git a/cc/layers/layer_unittest.cc b/cc/layers/layer_unittest.cc
index bd832beb930555ba343d6589a2b4ee3828a37460..c3648395f02fee27eacc41a915317deb0364dd61 100644
--- a/cc/layers/layer_unittest.cc
+++ b/cc/layers/layer_unittest.cc
@@ -42,7 +42,9 @@ class MockLayerTreeHost : public LayerTreeHost {
  public:
   explicit MockLayerTreeHost(FakeLayerTreeHostClient* client)
       : LayerTreeHost(client, nullptr, nullptr, LayerTreeSettings()) {
-    InitializeSingleThreaded(client, base::MessageLoopProxy::current());
+    InitializeSingleThreaded(client,
+                             base::MessageLoopProxy::current(),
+                             nullptr);
   }
 
   MOCK_METHOD0(SetNeedsCommit, void());
@@ -936,7 +938,8 @@ class LayerTreeHostFactory {
                shared_bitmap_manager_.get(),
                gpu_memory_buffer_manager_.get(),
                LayerTreeSettings(),
-               base::MessageLoopProxy::current()).Pass();
+               base::MessageLoopProxy::current(),
+               nullptr).Pass();
   }
 
   scoped_ptr<LayerTreeHost> Create(LayerTreeSettings settings) {
@@ -946,7 +949,8 @@ class LayerTreeHostFactory {
                shared_bitmap_manager_.get(),
                gpu_memory_buffer_manager_.get(),
                settings,
-               base::MessageLoopProxy::current()).Pass();
+               base::MessageLoopProxy::current(),
+               nullptr).Pass();
   }
 
  private: