Switch SkBlurImageFilter over to new onFilterImage interface

include/core/SkDevice.h

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDevice_DEFINED
 #define SkDevice_DEFINED
 
@@ skipping 360 matching lines @@
      *  a device that it knows how to draw, and that it knows how to identify if it is not of the
      *  same subclass (since drawDevice is passed a SkBaseDevice*). If the subclass cannot fulfill
      *  that contract (e.g. PDF cannot support some settings on the paint) it should return NULL,
      *  and the caller may then decide to explicitly create a bitmapdevice, knowing that later
      *  it could not call drawDevice with it (but it could call drawSprite or drawBitmap).
      */
     virtual SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) {
         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
     friend class SkDraw;
     friend class SkDrawIter;
     friend class SkDeviceFilteredPaint;
     friend class SkImageFilter::DeviceProxy;
     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.
     // TODO: move to SkBitmapDevice
     virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) {}
 
     virtual bool forceConservativeRasterClip() const { return false; }
 
     // just called by SkCanvas when built as a layer
     void setOrigin(int x, int y) { fOrigin.set(x, y); }
 
     /** Causes any deferred drawing to the device to be completed.
      */
     virtual void flush() {}
 
     virtual SkImageFilter::Cache* getImageFilterCache() { return NULL; }
 
     SkIPoint    fOrigin;
     SkMetaData* fMetaData;
     SkSurfaceProps fSurfaceProps;
 
 #ifdef SK_DEBUG
     bool        fAttachedToCanvas;
 #endif
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif