Implement crop rect for lighting image filters.

include/effects/SkMatrixConvolutionImageFilter.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 SkMatrixConvolutionImageFilter_DEFINED
 #define SkMatrixConvolutionImageFilter_DEFINED
 
@@ skipping 44 matching lines @@
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkMatrixConvolutionImageFilter)
 
 protected:
     SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer);
     virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
 
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
                                SkBitmap* result, SkIPoint* loc) SK_OVERRIDE;
 
 #if SK_SUPPORT_GPU
-    virtual bool asNewEffect(GrEffectRef** effect, GrTexture*) const SK_OVERRIDE;
+    virtual bool asNewEffect(GrEffectRef** effect, GrTexture*, const SkIPoint& offset) const SK_OVERRIDE;
 #endif
 
 private:
     SkISize   fKernelSize;
     SkScalar* fKernel;
     SkScalar  fGain;
     SkScalar  fBias;
     SkIPoint  fTarget;
     TileMode  fTileMode;
     bool      fConvolveAlpha;
     typedef SkImageFilter INHERITED;
 
     template <class PixelFetcher, bool convolveAlpha>
     void filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect);
     template <class PixelFetcher>
     void filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect);
     void filterInteriorPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect);
     void filterBorderPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect);
 };
 
 #endif