No need to cache local matrix in picture shader.

src/core/SkPictureShader.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPictureShader_DEFINED
 #define SkPictureShader_DEFINED
 
@@ skipping 30 matching lines @@
     SkPictureShader(SkPicture*, TileMode, TileMode, const SkMatrix* = NULL);
 
     SkShader* refBitmapShader(const SkMatrix&, const SkMatrix* localMatrix) const;
 
     SkPicture*  fPicture;
     TileMode    fTmx, fTmy;
 
     mutable SkMutex                 fCachedBitmapShaderMutex;
     mutable SkAutoTUnref<SkShader>  fCachedBitmapShader;
     mutable SkSize                  fCachedTileScale;
-    mutable SkMatrix                fCachedLocalMatrix;
 
     class PictureShaderContext : public SkShader::Context {
     public:
         static Context* Create(void* storage, const SkPictureShader&, const ContextRec&,
                                SkShader* bitmapShader);
 
         virtual ~PictureShaderContext();
 
         virtual uint32_t getFlags() const SK_OVERRIDE;
 
         virtual ShadeProc asAShadeProc(void** ctx) SK_OVERRIDE;
         virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
         virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count) SK_OVERRIDE;
 
     private:
         PictureShaderContext(const SkPictureShader&, const ContextRec&, SkShader* bitmapShader);
 
         SkAutoTUnref<SkShader>  fBitmapShader;
         SkShader::Context*      fBitmapShaderContext;
         void*                   fBitmapShaderContextStorage;
 
         typedef SkShader::Context INHERITED;
     };
 
     typedef SkShader INHERITED;
 };
 
 #endif // SkPictureShader_DEFINED