enforce 16byte alignment in shader contexts

experimental/SkPerlinNoiseShader2/SkPerlinNoiseShader2.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDither.h"
 #include "SkPerlinNoiseShader2.h"
 #include "SkColorFilter.h"
@@ skipping 553 matching lines @@
         rgba[channel] = SkScalarFloorToInt(255 * value);
     }
     return SkPreMultiplyARGB(rgba[3], rgba[0], rgba[1], rgba[2]);
 }
 
 SkShader::Context* SkPerlinNoiseShader2::onCreateContext(const ContextRec& rec,
                                                         void* storage) const {
     return new (storage) PerlinNoiseShaderContext(*this, rec);
 }
 
-size_t SkPerlinNoiseShader2::contextSize(const ContextRec&) const {
-    return sizeof(PerlinNoiseShaderContext);
+size_t SkPerlinNoiseShader2::onContextSize(const ContextRec&) const {
+    return SkAlign16(sizeof(PerlinNoiseShaderContext));
 }
 
 SkPerlinNoiseShader2::PerlinNoiseShaderContext::PerlinNoiseShaderContext(
         const SkPerlinNoiseShader2& shader, const ContextRec& rec)
     : INHERITED(shader, rec)
 {
     SkMatrix newMatrix = *rec.fMatrix;
     newMatrix.preConcat(shader.getLocalMatrix());
     if (rec.fLocalMatrix) {
         newMatrix.preConcat(*rec.fLocalMatrix);
@@ skipping 807 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif