add Method param to drawTextOnPath, supporting SVG spec

samplecode/SampleShaderText.cpp

Index: samplecode/SampleShaderText.cpp
diff --git a/samplecode/SampleShaderText.cpp b/samplecode/SampleShaderText.cpp
index 89abfc234549d0b355f64e2e3b346e823a07a8ab..e9f7a405e8ca675553b35f858b6075e537c89afc 100644
--- a/samplecode/SampleShaderText.cpp
+++ b/samplecode/SampleShaderText.cpp
@@ -168,6 +168,7 @@ protected:
         static const int testsPerCol = 8;
         static const int rowHeight = 60;
         static const int colWidth = 300;
+        SkCanvas::TextOnPathMethod method = SkCanvas::kStretch_TextOnPathMethod;
         canvas->save();
         for (size_t s = 0; s < SK_ARRAY_COUNT(shaders); s++) {
             canvas->save();
@@ -181,7 +182,7 @@ protected:
             ++i;
             canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth),
                               SkIntToScalar((i % testsPerCol) * rowHeight));
-            canvas->drawTextOnPath(text, textLen, path, NULL, paint);
+            canvas->drawTextOnPath(text, textLen, path, NULL, method, paint);
             canvas->restore();
         }
         canvas->restore();