compositor-worker: cc->blink mutation plumbing

content/renderer/gpu/render_widget_compositor_delegate.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 CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_DELEGATE_H_
 #define CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_DELEGATE_H_
 
 #include "cc/debug/frame_timing_tracker.h"
 
 namespace blink {
 class WebWidget;
 struct WebScreenInfo;
 }
 
 namespace cc {
 class BeginFrameSource;
 class OutputSurface;
+struct LayerTreeMutations;
 }
 
 namespace content {
 
 // Consumers of RenderWidgetCompositor implement this delegate in order to
 // transport compositing information across processes.
 class CONTENT_EXPORT RenderWidgetCompositorDelegate {
  public:
   // Report viewport related properties during a commit from the compositor
   // thread.
   virtual void ApplyViewportDeltas(
       const gfx::Vector2dF& inner_delta,
       const gfx::Vector2dF& outer_delta,
       const gfx::Vector2dF& elastic_overscroll_delta,
       float page_scale,
       float top_controls_delta) = 0;
 
+  // Report layer tree mutations from compositor workers during a commit.
+  virtual void ApplyMutations(const cc::LayerTreeMutations& mutations) = 0;
+
   // Notifies that the compositor has issed a BeginMainFrame.
   virtual void BeginMainFrame(double frame_time_sec) = 0;
 
   // Requests an OutputSurface to render into.
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(bool fallback) = 0;
 
   // Requests an external BeginFrameSource from the delegate.
   virtual scoped_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource() = 0;
 
   // Notifies that the draw commands for a committed frame have been issued.
@@ skipping 49 matching lines @@
   // perform actual painting work.
   virtual void WillBeginCompositorFrame() = 0;
 
  protected:
   virtual ~RenderWidgetCompositorDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_DELEGATE_H_