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

cc/trees/remote_channel_main.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_REMOTE_CHANNEL_MAIN_H_
 #define CC_TREES_REMOTE_CHANNEL_MAIN_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/trees/channel_main.h"
@@ skipping 16 matching lines @@
       ProxyMain* proxy_main,
       TaskRunnerProvider* task_runner_provider);
 
   ~RemoteChannelMain() override;
 
   // ChannelMain implementation
   void UpdateTopControlsStateOnImpl(TopControlsState constraints,
                                     TopControlsState current,
                                     bool animate) override;
   void InitializeOutputSurfaceOnImpl(OutputSurface* output_surface) override;
+  void InitializeMutatorOnImpl(
+      std::unique_ptr<LayerTreeMutator> mutator) override;
   void MainThreadHasStoppedFlingingOnImpl() override;
   void SetInputThrottledUntilCommitOnImpl(bool is_throttled) override;
   void SetDeferCommitsOnImpl(bool defer_commits) override;
   void FinishAllRenderingOnImpl(CompletionEvent* completion) override;
   void SetVisibleOnImpl(bool visible) override;
   void ReleaseOutputSurfaceOnImpl(CompletionEvent* completion) override;
   void MainFrameWillHappenOnImplForTesting(
       CompletionEvent* completion,
       bool* main_frame_will_happen) override;
   void SetNeedsRedrawOnImpl(const gfx::Rect& damage_rect) override;
@@ skipping 34 matching lines @@
   bool initialized_;
 
   base::WeakPtrFactory<RemoteChannelMain> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteChannelMain);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_REMOTE_CHANNEL_MAIN_H_