Make filters use SkImage instead of SkBitmap

src/core/SkPaintPriv.h

Index: src/core/SkPaintPriv.h
diff --git a/src/core/SkPaintPriv.h b/src/core/SkPaintPriv.h
index 88fc4fc3494ca1aed8d0eee6d71ea362bf2da50d..5c452f6e2387936fcedef86398f8732cf3f2c823 100644
--- a/src/core/SkPaintPriv.h
+++ b/src/core/SkPaintPriv.h
@@ -9,6 +9,7 @@
 #define SkPaintPriv_DEFINED
 
 class SkBitmap;
+class SkImage;
 class SkPaint;
 
 #include "SkTypes.h"
@@ -42,4 +43,16 @@ bool isPaintOpaque(const SkPaint* paint, SkPaintBitmapOpacity contentType);
 */
 bool isPaintOpaque(const SkPaint* paint,
                    const SkBitmap* bmpReplacesShader = NULL);
+
+/** Returns true if draw calls that use the paint will completely occlude
+    canvas contents that are covered by the draw.
+    @param paint The paint to be analyzed, NULL is equivalent to
+        the default paint.
+    @param imageReplacesShader a image to be used in place of the paint's
+        shader.
+    @return true if paint is opaque
+*/
+bool isPaintOpaque(const SkPaint* paint,
+                   const SkImage* imageReplacesShader);
+
 #endif