compositor-worker: Initialize CW machinery plumbing to compositor and fire CW rAF callbacks.

cc/trees/remote_channel_main.cc

Index: cc/trees/remote_channel_main.cc
diff --git a/cc/trees/remote_channel_main.cc b/cc/trees/remote_channel_main.cc
index 015692810ea7b4bf0700e6255e278e6b6ab1f6d7..d50dd747060307fa5302b9cfc65a66ffd99490da 100644
--- a/cc/trees/remote_channel_main.cc
+++ b/cc/trees/remote_channel_main.cc
@@ -65,6 +65,11 @@ void RemoteChannelMain::InitializeOutputSurfaceOnImpl(
   NOTREACHED() << "Should not be called on the server LayerTreeHost";
 }
 
+void RemoteChannelMain::InitializeMutatorOnImpl(
+    std::unique_ptr<LayerTreeMutator> mutator) {
+  // TODO(vollick): add support for CompositorWorker.

[jbroman, 2016/04/29 19:42:22]

nit: Maybe also a NOTIMPLEMENTED(); here?

[flackr, 2016/05/03 22:24:54]

Done.

+}
+
 void RemoteChannelMain::MainThreadHasStoppedFlingingOnImpl() {
   proto::CompositorMessage proto;
   proto::CompositorMessageToImpl* to_impl_proto = proto.mutable_to_impl();