Allow WebExternalTextureLayerClient to work with mailboxes.

webkit/compositor_bindings/web_compositor_support_impl.h

 // Copyright (c) 2012 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 WEBKIT_COMPOSITOR_BINDINGS_WEB_COMPOSITOR_SUPPORT_IMPL_H_
 #define WEBKIT_COMPOSITOR_BINDINGS_WEB_COMPOSITOR_SUPPORT_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/message_loop_proxy.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebLayer.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorSupport.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebTransformOperations.h"
 
 namespace WebKit {
 class WebGraphicsContext3D;
 }
 
 namespace webkit {
 
 class WebCompositorSupportImpl : public WebKit::WebCompositorSupport {
  public:
   WebCompositorSupportImpl();
   virtual ~WebCompositorSupportImpl();
 
   virtual WebKit::WebLayer* createLayer();
   virtual WebKit::WebContentLayer* createContentLayer(
       WebKit::WebContentLayerClient* client);
   virtual WebKit::WebExternalTextureLayer* createExternalTextureLayer(
       WebKit::WebExternalTextureLayerClient* client);
+  virtual WebKit::WebExternalTextureLayer*
+      createExternalTextureLayerForMailbox(
+          WebKit::WebExternalTextureLayerClient* client);
   virtual WebKit::WebImageLayer* createImageLayer();
   virtual WebKit::WebSolidColorLayer* createSolidColorLayer();
   virtual WebKit::WebScrollbarLayer* createScrollbarLayer(
       WebKit::WebScrollbar* scrollbar,
       WebKit::WebScrollbarThemePainter painter,
       WebKit::WebScrollbarThemeGeometry*);
   virtual WebKit::WebAnimation* createAnimation(
       const WebKit::WebAnimationCurve& curve,
       WebKit::WebAnimation::TargetProperty target,
       int animation_id);
   virtual WebKit::WebFloatAnimationCurve* createFloatAnimationCurve();
   virtual WebKit::WebTransformAnimationCurve* createTransformAnimationCurve();
   virtual WebKit::WebTransformOperations* createTransformOperations();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebCompositorSupportImpl);
 };
 
 }  // namespace webkit
 
 #endif  // WEBKIT_COMPOSITOR_BINDINGS_WEB_COMPOSITOR_SUPPORT_IMPL_H_