Allow WebExternalTextureLayers to receive a bitmap along with a mailbox

webkit/renderer/compositor_bindings/web_external_texture_layer_impl.h

 // Copyright 2011 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_RENDERER_COMPOSITOR_BINDINGS_WEB_EXTERNAL_TEXTURE_LAYER_IMPL_H_
 #define WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_EXTERNAL_TEXTURE_LAYER_IMPL_H_
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
 #include "cc/layers/texture_layer_client.h"
 #include "cc/resources/texture_mailbox.h"
 #include "third_party/WebKit/public/platform/WebExternalTextureLayer.h"
 #include "webkit/renderer/compositor_bindings/webkit_compositor_bindings_export.h"
 
 namespace WebKit {
 struct WebFloatRect;
 struct WebExternalTextureMailbox;
 }
 
 namespace webkit {
 
 class WebLayerImpl;
+class WebExternalBitmapImpl;
 
 class WebExternalTextureLayerImpl
     : public WebKit::WebExternalTextureLayer,
       public cc::TextureLayerClient,
       public base::SupportsWeakPtr<WebExternalTextureLayerImpl> {
  public:
   WEBKIT_COMPOSITOR_BINDINGS_EXPORT explicit WebExternalTextureLayerImpl(
       WebKit::WebExternalTextureLayerClient*,
       bool mailbox);
   virtual ~WebExternalTextureLayerImpl();
 
   // WebKit::WebExternalTextureLayer implementation.
   virtual WebKit::WebLayer* layer();
   virtual void clearTexture();
   virtual void setTextureId(unsigned texture_id);
   virtual void setFlipped(bool flipped);
   virtual void setUVRect(const WebKit::WebFloatRect& uv_rect);
   virtual void setOpaque(bool opaque);
   virtual void setPremultipliedAlpha(bool premultiplied);
 
   virtual void willModifyTexture();
   virtual void setRateLimitContext(bool rate_limit);
 
   // TextureLayerClient implementation.
   virtual unsigned PrepareTexture(cc::ResourceUpdateQueue*) OVERRIDE;
   virtual WebKit::WebGraphicsContext3D* Context3d() OVERRIDE;
-  virtual bool PrepareTextureMailbox(cc::TextureMailbox* mailbox) OVERRIDE;
+  virtual bool PrepareTextureMailbox(cc::TextureMailbox* mailbox,
+                                     bool use_shared_memory) OVERRIDE;
 
  private:
-  void DidReleaseMailbox(const WebKit::WebExternalTextureMailbox& mailbox,
-                         unsigned sync_point,
-                         bool lost_resource);
+  static void DidReleaseMailbox(
+      base::WeakPtr<WebExternalTextureLayerImpl> layer,
+      const WebKit::WebExternalTextureMailbox& mailbox,
+      WebExternalBitmapImpl* bitmap,
+      unsigned sync_point,
+      bool lost_resource);
+
+  WebExternalBitmapImpl* AllocateBitmap();
 
   WebKit::WebExternalTextureLayerClient* client_;
   scoped_ptr<WebLayerImpl> layer_;
   bool uses_mailbox_;
+  ScopedVector<WebExternalBitmapImpl> free_bitmaps_;
 
   DISALLOW_COPY_AND_ASSIGN(WebExternalTextureLayerImpl);
 };
 
 }  // namespace webkit
 
 #endif  // WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_EXTERNAL_TEXTURE_LAYER_IMPL_H_