cc: Clean up LayerTreeTest and TestHooks.

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 e2a0d8d1f16e356857654141fc383313e813374f..540acf6727f5c147f6a332e717168c5664fd5dae 100644
--- a/cc/trees/remote_channel_main.cc
+++ b/cc/trees/remote_channel_main.cc
@@ -172,12 +172,12 @@ void RemoteChannelMain::BeginMainFrameAbortedOnImpl(
   SendMessageProto(proto);
 }
 
-void RemoteChannelMain::StartCommitOnImpl(
+void RemoteChannelMain::NotifyReadyToCommitOnImpl(
     CompletionEvent* completion,
     LayerTreeHost* layer_tree_host,
     base::TimeTicks main_thread_start_time,
     bool hold_commit_for_activation) {
-  TRACE_EVENT0("cc.remote", "RemoteChannelMain::StartCommitOnImpl");
+  TRACE_EVENT0("cc.remote", "RemoteChannelMain::NotifyReadyToCommitOnImpl");
   proto::CompositorMessage proto;
   proto::CompositorMessageToImpl* to_impl_proto = proto.mutable_to_impl();
   to_impl_proto->set_message_type(proto::CompositorMessageToImpl::START_COMMIT);