Switch SkBlurImageFilter over to new onFilterImage interface

include/core/SkDevice.h

Index: include/core/SkDevice.h
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 73393422560aa7354d3d6d1ddafc68cc0788fff5..5d903fd074e13eb0f60337b93d0283f1c48f6188 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -378,6 +378,12 @@ protected:
         return NULL;
     }
 
+    /**
+     *  Calls through to drawSprite, processing the imagefilter.
+     */
+    virtual void drawBitmapAsSpriteWithImageFilter(const SkDraw&, const SkBitmap&,
+                                                   int x, int y, const SkPaint&);
+
 private:
     friend class SkCanvas;
     friend struct DeviceCM; //for setMatrixClip
@@ -388,11 +394,6 @@ private:
     friend class SkNoPixelsBitmapDevice;
     friend class SkSurface_Raster;
 
-    /**
-     *  Calls through to drawSprite, processing imagefilter as needed.
-     */
-    void drawBitmapAsSprite(const SkDraw&, const SkBitmap&, int x, int y, const SkPaint&);
-
     // used to change the backend's pixels (and possibly config/rowbytes)
     // but cannot change the width/height, so there should be no change to
     // any clip information.