Image filters: Make a recursive, forward-mapping bounds traversal.

include/effects/SkComposeImageFilter.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkComposeImageFilter_DEFINED
 #define SkComposeImageFilter_DEFINED
 
@@ skipping 18 matching lines @@
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeImageFilter)
 
 protected:
     explicit SkComposeImageFilter(SkImageFilter* inputs[2]) : INHERITED(2, inputs) {
         SkASSERT(inputs[0]);
         SkASSERT(inputs[1]);
     }
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* loc) const override;
-    bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*) const override;
+    bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*, MapDirection) const override;
 
 private:
     typedef SkImageFilter INHERITED;
 };
 
 #endif