Make filters use SkImage instead of SkBitmap

src/gpu/SkGpuDevice.h

Index: src/gpu/SkGpuDevice.h
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index 6cbf628e58b90724608af7dedc751fe5b60c2c03..4e56ff4abdc7f6bd705de305f9528159dabd95b9 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -92,6 +92,8 @@ public:
                                 SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE;
     virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
                             int x, int y, const SkPaint& paint) SK_OVERRIDE;
+    virtual void drawImage(const SkDraw&, const SkImage& image,
+                            int x, int y, const SkPaint& paint) SK_OVERRIDE;
     virtual void drawText(const SkDraw&, const void* text, size_t len,
                           SkScalar x, SkScalar y, const SkPaint&) SK_OVERRIDE;
     virtual void drawPosText(const SkDraw&, const void* text, size_t len,
@@ -116,13 +118,13 @@ public:
     const SkBitmap& onAccessBitmap() SK_OVERRIDE;
 
     bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE;
-    virtual bool filterImage(const SkImageFilter*, const SkBitmap&,
+    virtual bool filterImage(const SkImageFilter*, SkImage&,
                              const SkImageFilter::Context&,
-                             SkBitmap*, SkIPoint*) SK_OVERRIDE;
+                             SkAutoTUnref<SkImage>&, SkIPoint*) SK_OVERRIDE;
 
     bool filterTexture(GrContext*, GrTexture*, const SkImageFilter*,
                        const SkImageFilter::Context&,
-                       SkBitmap* result, SkIPoint* offset);
+                       SkAutoTUnref<SkImage>& result, SkIPoint* offset);
 
 protected:
     bool onReadPixels(const SkImageInfo&, void*, size_t, int, int) SK_OVERRIDE;