add Method param to drawTextOnPath, supporting SVG spec

gm/shadertext2.cpp

Index: gm/shadertext2.cpp
diff --git a/gm/shadertext2.cpp b/gm/shadertext2.cpp
index 31d1e8986957d7e4f7b648736babe08ccff34058..cb95cd471914278558fc48af53ecbe9cd8d10a5a 100644
--- a/gm/shadertext2.cpp
+++ b/gm/shadertext2.cpp
@@ -41,8 +41,10 @@ struct LabeledMatrix {
 };
 
 class ShaderText2GM : public GM {
+    SkCanvas::TextOnPathMethod fMethod;
+
 public:
-    ShaderText2GM() {
+    ShaderText2GM() : fMethod(SkCanvas::kStretch_TextOnPathMethod) {
         this->setBGColor(0xFFDDDDDD);
     }
 
@@ -174,8 +176,8 @@ protected:
 
                     canvas->save();
                         canvas->concat(matrices[m].fMatrix);
-                        canvas->drawTextOnPath(kText, kTextLen, path, NULL, paint);
-                        canvas->drawTextOnPath(kText, kTextLen, path, NULL, outlinePaint);
+                        canvas->drawTextOnPath(kText, kTextLen, path, NULL, fMethod, paint);
+                        canvas->drawTextOnPath(kText, kTextLen, path, NULL, fMethod, outlinePaint);
                     canvas->restore();
                     SkPaint stroke;
                     stroke.setStyle(SkPaint::kStroke_Style);