enforce 16byte alignment in shader contexts

src/core/SkColorShader.h

 /*
  * Copyright 2007 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 SkColorShader_DEFINED
 #define SkColorShader_DEFINED
 
 #include "SkShader.h"
 #include "SkPM4f.h"
 
 /** \class SkColorShader
     A Shader that represents a single color. In general, this effect can be
     accomplished by just using the color field on the paint, but if an
     actual shader object is needed, this provides that feature.
 */
 class SK_API SkColorShader : public SkShader {
 public:
     /** Create a ColorShader that ignores the color in the paint, and uses the
         specified color. Note: like all shaders, at draw time the paint's alpha
         will be respected, and is applied to the specified color.
     */
     explicit SkColorShader(SkColor c);
 
     bool isOpaque() const override;
 
-    size_t contextSize(const ContextRec&) const override {
-        return sizeof(ColorShaderContext);
-    }
-
     class ColorShaderContext : public SkShader::Context {
     public:
         ColorShaderContext(const SkColorShader& shader, const ContextRec&);
 
         uint32_t getFlags() const override;
         void shadeSpan(int x, int y, SkPMColor span[], int count) override;
         void shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) override;
         void shadeSpan4f(int x, int y, SkPM4f[], int count) override;
 
     private:
@@ skipping 11 matching lines @@
                                                    const SkMatrix*, SkFilterQuality) const override;
 #endif
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorShader)
 
 protected:
     SkColorShader(SkReadBuffer&);
     void flatten(SkWriteBuffer&) const override;
     Context* onCreateContext(const ContextRec&, void* storage) const override;
+    size_t onContextSize(const ContextRec&) const override {
+        return sizeof(ColorShaderContext);
+    }
     bool onAsLuminanceColor(SkColor* lum) const override {
         *lum = fColor;
         return true;
     }
 
 private:
     SkColor fColor;
 
     typedef SkShader INHERITED;
 };
 
 #endif