Implement support for a Context parameter in image filters

src/utils/SkPictureUtils.cpp

Index: src/utils/SkPictureUtils.cpp
diff --git a/src/utils/SkPictureUtils.cpp b/src/utils/SkPictureUtils.cpp
index 99914a7c7afe78f04be4dfbb8cc73dbac61743f8..23d7afd7a210ddcf3bc29904478316a284094baa 100644
--- a/src/utils/SkPictureUtils.cpp
+++ b/src/utils/SkPictureUtils.cpp
@@ -76,7 +76,7 @@ public:
     virtual void unlockPixels() SK_OVERRIDE { nothing_to_do(); }
     virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
     virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
-    virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkMatrix&,
+    virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
                              SkBitmap* result, SkIPoint* offset) SK_OVERRIDE {
         return false;
     }