[SVGDom/experimental] Initial SVGLength support

experimental/svg/model/SkSVGSVG.h

Index: experimental/svg/model/SkSVGSVG.h
diff --git a/experimental/svg/model/SkSVGSVG.h b/experimental/svg/model/SkSVGSVG.h
index 8e69d144d6ba4417f7117f9ff8ce0c2d4f8e7bb8..27631f5a3169c6c51b35e8eaec6b0688df1a1d60 100644
--- a/experimental/svg/model/SkSVGSVG.h
+++ b/experimental/svg/model/SkSVGSVG.h
@@ -9,6 +9,7 @@
 #define SkSVGSVG_DEFINED
 
 #include "SkSVGContainer.h"
+#include "SkSVGTypes.h"
 
 class SkSVGSVG : public SkSVGContainer {
 public:
@@ -16,9 +17,22 @@ public:
 
     static sk_sp<SkSVGSVG> Make() { return sk_sp<SkSVGSVG>(new SkSVGSVG()); }
 
+    void setX(const SkSVGLength&);
+    void setY(const SkSVGLength&);
+    void setWidth(const SkSVGLength&);
+    void setHeight(const SkSVGLength&);
+
+protected:
+    void onSetAttribute(SkSVGAttribute, const SkSVGValue&) override;
+
 private:
     SkSVGSVG();
 
+    SkSVGLength fX      = SkSVGLength(0);
+    SkSVGLength fY      = SkSVGLength(0);
+    SkSVGLength fWidth  = SkSVGLength(100, SkSVGLength::Unit::kPercentage);
+    SkSVGLength fHeight = SkSVGLength(100, SkSVGLength::Unit::kPercentage);
+
     typedef SkSVGContainer INHERITED;
 };