[SVGDom] Linear gradient 'spreadMethod' support

experimental/svg/model/SkSVGAttributeParser.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 SkSVGAttributeParser_DEFINED
 #define SkSVGAttributeParser_DEFINED
 
 #include "SkSVGTypes.h"
 
 class SkSVGAttributeParser : public SkNoncopyable {
 public:
     SkSVGAttributeParser(const char[]);
 
     bool parseColor(SkSVGColorType*);
     bool parseNumber(SkSVGNumberType*);
     bool parseLength(SkSVGLength*);
     bool parseViewBox(SkSVGViewBoxType*);
     bool parseTransform(SkSVGTransformType*);
     bool parsePaint(SkSVGPaint*);
     bool parseLineCap(SkSVGLineCap*);
     bool parseLineJoin(SkSVGLineJoin*);
     bool parsePoints(SkSVGPointsType*);
     bool parseIRI(SkSVGStringType*);
+    bool parseSpreadMethod(SkSVGSpreadMethod*);
 
 private:
     // Stack-only
     void* operator new(size_t) = delete;
     void* operator new(size_t, void*) = delete;
 
     template <typename F>
     bool advanceWhile(F func);
 
     bool parseWSToken();
@@ skipping 22 matching lines @@
     template <typename Func, typename T>
     bool parseParenthesized(const char* prefix, Func, T* result);
 
     // The current position in the input string.
     const char* fCurPos;
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif // SkSVGAttributeParser_DEFINED