3D Compositing in <browser>, first draft.

content/browser/renderer_host/render_widget_host_view_mac.h

Index: content/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index 447c7c7f826e16bc1db737e84ae700ab1f9bd33c..9871aa3b98d33ec5af6af3160e18bee2a898bef5 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -290,7 +290,6 @@ class RenderWidgetHostViewMac : public content::RenderWidgetHostViewBase {
   virtual void AboutToWaitForBackingStoreMsg() OVERRIDE;
   virtual void GetScreenInfo(WebKit::WebScreenInfo* results) OVERRIDE;
   virtual gfx::Rect GetRootWindowBounds() OVERRIDE;
-  virtual gfx::GLSurfaceHandle GetCompositingSurface() OVERRIDE;
 
   void DrawAcceleratedSurfaceInstance(
       CGLContextObj context,
@@ -427,6 +426,19 @@ class RenderWidgetHostViewMac : public content::RenderWidgetHostViewBase {
   //   pairs of (route_id, gpu_host_id).
   std::list<std::pair<int32, int32> > pending_swap_buffers_acks_;
 
+  class CompositingDelegateMac : public CompositingDelegate {
+   public:
+    virtual gfx::GLSurfaceHandle GetCompositingSurface() OVERRIDE; 
+    virtual bool ResizeNeedsNewSurface() OVERRIDE;
+
+   private:
+    friend class RenderWidgetHostViewMac;
+    CompositingDelegateMac(RenderWidgetHostViewMac* view)
+      : view_(view)
+    {}
+    RenderWidgetHostViewMac* view_;
+  };
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };