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

third_party/WebKit/public/platform/WebLayerTreeView.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 26 matching lines @@
 
 class SkBitmap;
 
 namespace cc {
 class AnimationTimeline;
 }
 
 namespace blink {
 
 class WebCompositeAndReadbackAsyncCallback;
+class WebCompositorMutatorClient;
 class WebLayer;
 class WebLayoutAndPaintAsyncCallback;
 struct WebPoint;
 struct WebSelectionBound;
 class WebSelection;
 class WebWidget;
 
 class WebLayerTreeView {
 public:
     virtual ~WebLayerTreeView() { }
@@ skipping 100 matching lines @@
     virtual void setShowFPSCounter(bool) { }
 
     // Toggles the paint rects in the HUD layer
     virtual void setShowPaintRects(bool) { }
 
     // Toggles the debug borders on layers
     virtual void setShowDebugBorders(bool) { }
 
     // Toggles scroll bottleneck rects on the HUD layer
     virtual void setShowScrollBottleneckRects(bool) { }
+
+    // Mutations are plumbed back to the layer tree via the mutator client.
+    virtual void setMutatorClient(std::unique_ptr<WebCompositorMutatorClient>) {}

[Rick Byers, 2016/05/05 14:02:22]

nit: this probably doesn't belong in this "Debugging / dangerous" section,
right?  Move it up to the "flow control and scheduling" section?

[flackr, 2016/05/05 15:13:15]

Correct, flow control and scheduling sounds right. Done.

 };
 
 } // namespace blink
 
 #endif // WebLayerTreeView_h