cc: Replace RasterBuffer::Acquire/ReleaseCanvas with Playback function.

cc/resources/raster_buffer.h

Index: cc/resources/raster_buffer.h
diff --git a/cc/resources/raster_buffer.h b/cc/resources/raster_buffer.h
index d148b72dfe5a913e805b46fe27e8f9166ff0420a..df7ea5fe20bc1f70298a068dc678382903822ced 100644
--- a/cc/resources/raster_buffer.h
+++ b/cc/resources/raster_buffer.h
@@ -6,19 +6,21 @@
 #define CC_RESOURCES_RASTER_BUFFER_H_
 
 #include "cc/base/cc_export.h"
-#include "skia/ext/refptr.h"
-
-class SkCanvas;
+#include "ui/gfx/geometry/rect.h"
 
 namespace cc {
+class PicturePileImpl;
+class RenderingStatsInstrumentation;
 
 class CC_EXPORT RasterBuffer {
  public:
   RasterBuffer();
   virtual ~RasterBuffer();
 
-  virtual skia::RefPtr<SkCanvas> AcquireSkCanvas() = 0;
-  virtual void ReleaseSkCanvas(const skia::RefPtr<SkCanvas>& canvas) = 0;
+  virtual void Playback(const PicturePileImpl* picture_pile,
+                        const gfx::Rect& rect,
+                        float scale,
+                        RenderingStatsInstrumentation* stats) = 0;
 };
 
 }  // namespace cc