Switch SkBlurImageFilter over to new onFilterImage interface

src/gpu/SkGpuDevice.h

Index: src/gpu/SkGpuDevice.h
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index 8d69e4ce8e0a702883218c8a5a1734a71d893ded..23e3d643fe51f3f4350e316f3d1316eda5ce62f7 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -262,6 +262,9 @@ private:
     static GrRenderTarget* CreateRenderTarget(GrContext*, SkBudgeted, const SkImageInfo&,
                                               int sampleCount, GrTextureStorageAllocator);
 
+    void drawBitmapAsSpriteWithImageFilter(const SkDraw&, const SkBitmap&, int x, int y,
+                                           const SkPaint&) override;
+
     friend class GrAtlasTextContext;
     friend class SkSurface_Gpu;      // for access to surfaceProps
     typedef SkBaseDevice INHERITED;