Implement crop rect for SkImageFilter

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
 
 #include "SkImageFilter.h"
 
 class SkColorFilter;
 
 class SK_API SkColorFilterImageFilter : public SkImageFilter {
 public:
-    static SkColorFilterImageFilter* Create(SkColorFilter* cf, SkImageFilter* input = NULL);
+    static SkColorFilterImageFilter* Create(SkColorFilter* cf,
+                                            SkImageFilter* input = NULL,
+                                            const SkIRect* cropRect = NULL);
     virtual ~SkColorFilterImageFilter();
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorFilterImageFilter)
 
 protected:
     SkColorFilterImageFilter(SkFlattenableReadBuffer& buffer);
     virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
 
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
                                SkBitmap* result, SkIPoint* loc) SK_OVERRIDE;
 
     virtual bool asColorFilter(SkColorFilter**) const SK_OVERRIDE;
 
 private:
-    SkColorFilterImageFilter(SkColorFilter* cf, SkImageFilter* input);
+    SkColorFilterImageFilter(SkColorFilter* cf,
+                             SkImageFilter* input,
+                             const SkIRect* cropRect = NULL);
     SkColorFilter*  fColorFilter;
 
     typedef SkImageFilter INHERITED;
 };
 
 #endif