Make DrawingBuffer and Canvas2DLayerBridge be cc::TextureLayerClients.

third_party/WebKit/public/platform/WebExternalTextureLayerClient.h

-/*
- * Copyright (C) 2012 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef WebExternalTextureLayerClient_h
-#define WebExternalTextureLayerClient_h
-
-#include "WebCommon.h"
-#include "WebSize.h"
-
-namespace blink {
-
-class WebExternalBitmap;
-struct WebExternalTextureMailbox;
-
-class BLINK_PLATFORM_EXPORT WebExternalTextureLayerClient {
-public:
-    // Returns true and provides a mailbox if a new frame is available. If the WebExternalBitmap
-    // isn't 0, then it should also be filled in with the contents of this frame.
-    // Returns false if no new data is available and the old mailbox and bitmap are to be reused.
-    virtual bool prepareMailbox(WebExternalTextureMailbox*, WebExternalBitmap* = 0) = 0;
-
-    // Notifies the client when a mailbox is no longer in use by the compositor and provides
-    // a sync point to wait on before the mailbox could be consumes again by the client. The
-    // boolean flag indicates if the mailbox resource is treated as lost by client.
-    virtual void mailboxReleased(const WebExternalTextureMailbox&, bool lostResource) = 0;
-
-protected:
-    virtual ~WebExternalTextureLayerClient() { }
-};
-
-} // namespace blink
-
-#endif // WebExternalTextureLayerClient_h