cc: Make separate interface for BeginFrame ipc from OutputSurface

cc/layers/texture_layer_unittest.cc

Index: cc/layers/texture_layer_unittest.cc
diff --git a/cc/layers/texture_layer_unittest.cc b/cc/layers/texture_layer_unittest.cc
index 99c1e9e9b218f82c29a66a3019a48f91bc2277b1..872f9e0d64430dec34ecefe49e96f1c7cb1aee36 100644
--- a/cc/layers/texture_layer_unittest.cc
+++ b/cc/layers/texture_layer_unittest.cc
@@ -52,7 +52,9 @@ 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());