Reland of Implement canComputeFastBounds() for image filters.

include/effects/SkColorFilterImageFilter.h

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkColorFilterImageFilter_DEFINED
 #define SkColorFilterImageFilter_DEFINED
 
@@ skipping 11 matching lines @@
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorFilterImageFilter)
 
 protected:
     void flatten(SkWriteBuffer&) const override;
 
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* loc) const override;
 
     bool onIsColorFilterNode(SkColorFilter**) const override;
+    bool affectsTransparentBlack() const override;
 
 private:
     SkColorFilterImageFilter(SkColorFilter* cf,
                              SkImageFilter* input,
                              const CropRect* cropRect);
     SkColorFilter*  fColorFilter;
 
     typedef SkImageFilter INHERITED;
 };
 
 #endif