enforce 16byte alignment in shader contexts

src/core/SkPictureShader.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPictureShader.h"
 
 #include "SkBitmap.h"
@@ skipping 223 matching lines @@
         tileShader.reset(tileImage->newShader(fTmx, fTmy, &shaderMatrix));
 
         const SkImageInfo tileInfo = SkImageInfo::MakeN32Premul(tileSize);
         SkResourceCache::Add(new BitmapShaderRec(key, tileShader.get(),
                                                  tileInfo.getSafeSize(tileInfo.minRowBytes())));
     }
 
     return tileShader.detach();
 }
 
-size_t SkPictureShader::contextSize(const ContextRec&) const {
-    return sizeof(PictureShaderContext);
+size_t SkPictureShader::onContextSize(const ContextRec&) const {
+    return SkAlign16(sizeof(PictureShaderContext));
 }
 
 SkShader::Context* SkPictureShader::onCreateContext(const ContextRec& rec, void* storage) const {
     SkAutoTUnref<SkShader> bitmapShader(this->refBitmapShader(*rec.fMatrix, rec.fLocalMatrix));
     if (nullptr == bitmapShader.get()) {
         return nullptr;
     }
     return PictureShaderContext::Create(storage, *this, rec, bitmapShader);
 }
 
@@ skipping 69 matching lines @@
     if (context) {
         maxTextureSize = context->caps()->maxTextureSize();
     }
     SkAutoTUnref<SkShader> bitmapShader(this->refBitmapShader(viewM, localMatrix, maxTextureSize));
     if (!bitmapShader) {
         return nullptr;
     }
     return bitmapShader->asFragmentProcessor(context, viewM, nullptr, fq);
 }
 #endif