Refactoring ImageBuffer to decouple it from Canvas2DLayerBridge

Source/core/platform/graphics/gpu/AcceleratedImageBufferSurface.h

Index: Source/core/platform/graphics/gpu/AcceleratedImageBufferSurface.h
diff --git a/Source/core/rendering/LayoutRectRecorder.h b/Source/core/platform/graphics/gpu/AcceleratedImageBufferSurface.h
similarity index 67%
copy from Source/core/rendering/LayoutRectRecorder.h
copy to Source/core/platform/graphics/gpu/AcceleratedImageBufferSurface.h
index 9fd331e2aca95cb262bbbd4e738d3b78286caa2d..74c35e3c22409e4cda9ef9e26dd53d64766d1b95 100644
--- a/Source/core/rendering/LayoutRectRecorder.h
+++ b/Source/core/platform/graphics/gpu/AcceleratedImageBufferSurface.h
@@ -28,32 +28,30 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef LayoutRectRecorder_h
-#define LayoutRectRecorder_h
+#ifndef AcceleratedImageBufferSurface_h
+#define AcceleratedImageBufferSurface_h
 
-#include "platform/geometry/LayoutRect.h"
-#include "wtf/Noncopyable.h"
+#include "platform/graphics/ImageBufferSurface.h"
+#include "wtf/OwnPtr.h"
 
 namespace WebCore {
 
-class RenderLayerModelObject;
-class RenderObject;
-
-class LayoutRectRecorder {
-    WTF_MAKE_NONCOPYABLE(LayoutRectRecorder);
+class AcceleratedImageBufferSurface : public ImageBufferSurface {
+    WTF_MAKE_NONCOPYABLE(AcceleratedImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
 public:
-    LayoutRectRecorder(RenderObject&, bool skipRecording = false);
-    ~LayoutRectRecorder();
+    AcceleratedImageBufferSurface(const IntSize&, OpacityMode = NonOpaque, float resolutionScale = 1.0f, int msaaSampleCount = 0);

[Stephen White, 2013/12/04 21:18:40]

I'm 99.99% certain we don't support hiDPI canvas. Do we still need
resolutionScale here?

+    virtual ~AcceleratedImageBufferSurface() { }
 
-    static bool shouldRecordLayoutRects();
+    virtual SkCanvas* canvas() const OVERRIDE { return m_canvas.get();}
+    virtual bool isValid() const OVERRIDE { return m_canvas; }
+    virtual bool isAccelerated() const OVERRIDE { return true; }
+    virtual Platform3DObject getBackingTexture() const OVERRIDE;
 
 private:
-    RenderObject& m_object;
-    RenderLayerModelObject* m_repaintContainer;
-    unsigned m_skipRecording : 1;
+    OwnPtr<SkCanvas> m_canvas;
 };
 
-} // namespace WebCore
 
-#endif // LayoutRectRecorder_h
+} // namespace WebCore
 
+#endif