Refactoring ImageBuffer to decouple it from Canvas2DLayerBridge

Source/platform/graphics/UnacceleratedImageBufferSurface.h

Index: Source/platform/graphics/UnacceleratedImageBufferSurface.h
diff --git a/Source/core/rendering/LayoutRectRecorder.h b/Source/platform/graphics/UnacceleratedImageBufferSurface.h
similarity index 72%
copy from Source/core/rendering/LayoutRectRecorder.h
copy to Source/platform/graphics/UnacceleratedImageBufferSurface.h
index c92eb5efc90d50bfbac57653cda3a1c84df4b4b2..5ee66b49f46bd8623bc069959d716ced0a7b42df 100644
--- a/Source/core/rendering/LayoutRectRecorder.h
+++ b/Source/platform/graphics/UnacceleratedImageBufferSurface.h
@@ -28,31 +28,27 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef LayoutRectRecorder_h
-#define LayoutRectRecorder_h
+#ifndef UnacceleratedImageBufferSurface_h
+#define UnacceleratedImageBufferSurface_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 PLATFORM_EXPORT UnacceleratedImageBufferSurface : public ImageBufferSurface {
+    WTF_MAKE_NONCOPYABLE(UnacceleratedImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
 public:
-    LayoutRectRecorder(RenderObject&, bool skipRecording = false);
-    ~LayoutRectRecorder();
+    UnacceleratedImageBufferSurface(const IntSize&, OpacityMode = NonOpaque);
+    virtual ~UnacceleratedImageBufferSurface() { }
 
-    static bool shouldRecordLayoutRects();
+    virtual SkCanvas* canvas() const OVERRIDE { return m_canvas.get(); }
+    virtual bool isValid() const OVERRIDE { return m_canvas; }
 
 private:
-    RenderObject& m_object;
-    bool m_skipRecording;
+    OwnPtr<SkCanvas> m_canvas;
 };
 
 } // namespace WebCore
 
-#endif // LayoutRectRecorder_h
-
+#endif