[SVGDom] Add rx/ry support for <rect>

experimental/svg/model/SkSVGAttribute.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkSVGAttribute_DEFINED
 #define SkSVGAttribute_DEFINED
 
 #include "SkSVGTypes.h"
 #include "SkTLazy.h"
 
 class SkSVGRenderContext;
 
 enum class SkSVGAttribute {
     kD,
     kFill,
     kHeight,
+    kRx,
+    kRy,
     kStroke,
     kTransform,
     kViewBox,
     kWidth,
     kX,
     kY,
 
     kUnknown,
 };
 
 class SkSVGPresentationAttributes {
 public:
     SkSVGPresentationAttributes();
 
     void setFill(const SkSVGColorType&);
     void setStroke(const SkSVGColorType&);
 
     void applyTo(SkSVGRenderContext*) const;
 
 private:
     // Color only for now.
     SkSVGColorType fFill;
     SkSVGColorType fStroke;
 
     unsigned fFillIsSet   : 1;
     unsigned fStrokeIsSet : 1;
 };
 
 #endif // SkSVGAttribute_DEFINED