Allow WebExternalTextureLayerClient to work with mailboxes.

webkit/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_COMPOSITOR_BINDINGS_WEB_EXTERNAL_TEXTURE_LAYER_IMPL_H_
 #define WEBKIT_COMPOSITOR_BINDINGS_WEB_EXTERNAL_TEXTURE_LAYER_IMPL_H_
 
+#include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/texture_layer_client.h"
+#include "cc/resources/texture_mailbox.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebExternalTextureLayer.h"
 #include "webkit/compositor_bindings/webkit_compositor_bindings_export.h"
 
-namespace WebKit { struct WebFloatRect; }
+namespace WebKit {
+struct WebFloatRect;
+struct WebExternalTextureMailbox;
+}
 
 namespace webkit {
 
 class WebLayerImpl;
 
-class WebExternalTextureLayerImpl : public WebKit::WebExternalTextureLayer,
-                                    public cc::TextureLayerClient {
+class WebExternalTextureLayerImpl
+    : public WebKit::WebExternalTextureLayer,
+      public cc::TextureLayerClient,
+      public base::SupportsWeakPtr<WebExternalTextureLayerImpl> {
  public:
   WEBKIT_COMPOSITOR_BINDINGS_EXPORT explicit WebExternalTextureLayerImpl(
-      WebKit::WebExternalTextureLayerClient*);
+      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* out_mailbox) OVERRIDE;

[jamesr, 2013/04/11 18:11:15]

I don't think the out_ prefix is necessary - in Chromium, pointer parameters are
pretty much always either out or inout parameters (since in parameters are
passed by value or const ref) and we typically avoid hungarian-style tags.

 
  private:
+  void OnMailboxReleased(const WebKit::WebExternalTextureMailbox& mailbox,
+                         unsigned sync_point,
+                         bool lost_resource);
+
   WebKit::WebExternalTextureLayerClient* client_;
   scoped_ptr<WebLayerImpl> layer_;
+  bool uses_mailbox_;
 
   DISALLOW_COPY_AND_ASSIGN(WebExternalTextureLayerImpl);
 };
 
 }  // namespace webkit
 
 #endif  // WEBKIT_COMPOSITOR_BINDINGS_WEB_EXTERNAL_TEXTURE_LAYER_IMPL_H_