enforce 16byte alignment in shader contexts

src/effects/gradients/SkTwoPointConicalGradient.h

Index: src/effects/gradients/SkTwoPointConicalGradient.h
diff --git a/src/effects/gradients/SkTwoPointConicalGradient.h b/src/effects/gradients/SkTwoPointConicalGradient.h
index 954b09698eec907016be913e14a46e6531a3cb99..5783c39bd4769e7274064fd086ec02311d69430d 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient.h
+++ b/src/effects/gradients/SkTwoPointConicalGradient.h
@@ -45,9 +45,6 @@ public:
                               const SkPoint& end, SkScalar endRadius,
                               bool flippedGrad, const Descriptor&);
 
-
-    size_t contextSize(const ContextRec&) const override;
-
     class TwoPointConicalGradientContext : public SkGradientShaderBase::GradientShaderBaseContext {
     public:
         TwoPointConicalGradientContext(const SkTwoPointConicalGradient&, const ContextRec&);
@@ -82,6 +79,7 @@ public:
 protected:
     SkTwoPointConicalGradient(SkReadBuffer& buffer);
     void flatten(SkWriteBuffer& buffer) const override;
+    size_t onContextSize(const ContextRec&) const override;
     Context* onCreateContext(const ContextRec&, void* storage) const override;
 
 private: