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 32b4b4c322e84ce13cc25c02441873b4f57b27d5..328628c9f6a3b1651c363d33290e22e5c04051fe 100644
--- a/cc/layers/layer_unittest.cc
+++ b/cc/layers/layer_unittest.cc
@@ -41,7 +41,9 @@ class MockLayerTreeHost : public LayerTreeHost {
  public:
   explicit MockLayerTreeHost(FakeLayerTreeHostClient* client)
       : LayerTreeHost(client, NULL, LayerTreeSettings()) {
-    InitializeSingleThreaded(client, base::MessageLoopProxy::current());
+    InitializeSingleThreaded(client,
+                             base::MessageLoopProxy::current(),
+                             scoped_ptr<ExternalBeginFrameSource>());

[danakj, 2014/10/10 16:03:35]

pass nullptr instead

[simonhong, 2014/10/15 01:04:21]

Done.

   }
 
   MOCK_METHOD0(SetNeedsCommit, void());
@@ -934,7 +936,8 @@ class LayerTreeHostFactory {
                &client_,
                shared_bitmap_manager_.get(),
                LayerTreeSettings(),
-               base::MessageLoopProxy::current()).Pass();
+               base::MessageLoopProxy::current(),
+               scoped_ptr<ExternalBeginFrameSource>()).Pass();

[danakj, 2014/10/10 16:03:35]

nullptr here, etc

[simonhong, 2014/10/15 01:04:21]

Done.

   }
 
   scoped_ptr<LayerTreeHost> Create(LayerTreeSettings settings) {
@@ -943,7 +946,8 @@ class LayerTreeHostFactory {
                &client_,
                shared_bitmap_manager_.get(),
                settings,
-               base::MessageLoopProxy::current()).Pass();
+               base::MessageLoopProxy::current(),
+               scoped_ptr<ExternalBeginFrameSource>()).Pass();
   }
 
  private: