Refactoring ImageBuffer to decouple it from Canvas2DLayerBridge

Source/platform/graphics/gpu/WebGLImageBufferSurface.h

 /*
  * Copyright (c) 2013, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR 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 GaneshUtils_h
-#define GaneshUtils_h
+#ifndef WebGLImageBufferSurface_h
+#define WebGLImageBufferSurface_h
 
-#include "platform/PlatformExport.h"
-#include "platform/geometry/IntSize.h"
+#include "platform/graphics/ImageBufferSurface.h"
 #include "third_party/skia/include/core/SkBitmap.h"
-#include "third_party/skia/include/gpu/GrContext.h"
 
 namespace WebCore {
 
-bool PLATFORM_EXPORT ensureTextureBackedSkBitmap(GrContext*, SkBitmap&, const IntSize&, GrSurfaceOrigin, GrPixelConfig);
+// This is a GPU backed surface that has no canvas or render target.
+class PLATFORM_EXPORT WebGLImageBufferSurface : public ImageBufferSurface {
+    WTF_MAKE_NONCOPYABLE(WebGLImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
+public:
+    WebGLImageBufferSurface(const IntSize&, OpacityMode = NonOpaque);
+    virtual ~WebGLImageBufferSurface() { }
+
+    virtual SkCanvas* canvas() const OVERRIDE { return 0; }
+    virtual const SkBitmap& bitmap() const OVERRIDE { return m_bitmap; }
+    virtual bool isValid() const OVERRIDE { return m_bitmap.pixelRef(); }
+    virtual bool isAccelerated() const OVERRIDE { return true; }
+    virtual Platform3DObject getBackingTexture() const OVERRIDE;
+
+private:
+    SkBitmap m_bitmap;
+};
+
 
 } // namespace WebCore
 
-#endif // GaneshUtils_h
+#endif