enforce 16byte alignment in shader contexts

src/image/SkImageShader.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcShader.h"
 #include "SkBitmapProvider.h"
 #include "SkImage_Base.h"
@@ skipping 24 matching lines @@
     buffer.writeUInt(fTileModeX);
     buffer.writeUInt(fTileModeY);
     buffer.writeMatrix(this->getLocalMatrix());
     buffer.writeImage(fImage);
 }
 
 bool SkImageShader::isOpaque() const {
     return fImage->isOpaque();
 }
 
-size_t SkImageShader::contextSize(const ContextRec& rec) const {
+size_t SkImageShader::onContextSize(const ContextRec& rec) const {
     return SkBitmapProcShader::ContextSize(rec);
 }
 
 SkShader::Context* SkImageShader::onCreateContext(const ContextRec& rec, void* storage) const {
     return SkBitmapProcShader::MakeContext(*this, fTileModeX, fTileModeY,
                                            SkBitmapProvider(fImage), rec, storage);
 }
 
 SkShader* SkImageShader::Create(const SkImage* image, TileMode tx, TileMode ty,
                                 const SkMatrix* localMatrix) {
@@ skipping 69 matching lines @@
         inner.reset(GrSimpleTextureEffect::Create(texture, matrix, params));
     }
 
     if (GrPixelConfigIsAlphaOnly(texture->config())) {
         return SkRef(inner.get());
     }
     return GrFragmentProcessor::MulOutputByInputAlpha(inner);
 }
 
 #endif