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

cc/trees/channel_main.h

 // Copyright 2015 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_CHANNEL_MAIN_H_
 #define CC_TREES_CHANNEL_MAIN_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/base/completion_event.h"
 #include "cc/input/top_controls_state.h"
 #include "cc/output/output_surface.h"
 #include "cc/scheduler/begin_frame_source.h"
 #include "cc/scheduler/commit_earlyout_reason.h"
 #include "cc/trees/proxy_common.h"
 
 namespace cc {
 
+class LayerTreeMutator;
+
 // ChannelMain and ChannelImpl provide an abstract communication layer for
 // the main and impl side of the compositor.
 //
 // The communication sequence between the 2 sides is:
 //
 // LayerTreeHost<-->ProxyMain<-->ChannelMain
 //                                      |
 //                                      |
 //                               ChannelImpl<-->ProxyImpl<-->LayerTreeHostImpl
 
 class CC_EXPORT ChannelMain {
  public:
   virtual ~ChannelMain() {}
 
   // Interface for commands sent to ProxyImpl
   virtual void UpdateTopControlsStateOnImpl(TopControlsState constraints,
                                             TopControlsState current,
                                             bool animate) = 0;
   virtual void InitializeOutputSurfaceOnImpl(OutputSurface* output_surface) = 0;
+  virtual void InitializeMutatorOnImpl(
+      std::unique_ptr<LayerTreeMutator> mutator) = 0;
   virtual void MainThreadHasStoppedFlingingOnImpl() = 0;
   virtual void SetInputThrottledUntilCommitOnImpl(bool is_throttled) = 0;
   virtual void SetDeferCommitsOnImpl(bool defer_commits) = 0;
   virtual void FinishAllRenderingOnImpl(CompletionEvent* completion) = 0;
   virtual void SetVisibleOnImpl(bool visible) = 0;
   virtual void ReleaseOutputSurfaceOnImpl(CompletionEvent* completion) = 0;
   virtual void MainFrameWillHappenOnImplForTesting(
       CompletionEvent* completion,
       bool* main_frame_will_happen) = 0;
   virtual void SetNeedsRedrawOnImpl(const gfx::Rect& damage_rect) = 0;
@@ skipping 11 matching lines @@
       LayerTreeHost* layer_tree_host,
       std::unique_ptr<BeginFrameSource> external_begin_frame_source) = 0;
 
   // Must be called before deleting the channel.
   virtual void SynchronouslyCloseImpl() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_CHANNEL_MAIN_H_