add Method param to drawTextOnPath, supporting SVG spec

src/core/SkPicturePlayback.cpp

Index: src/core/SkPicturePlayback.cpp
diff --git a/src/core/SkPicturePlayback.cpp b/src/core/SkPicturePlayback.cpp
index 4f775cf9fd93305cd94adf1f9172aed90f516d4f..c5cceca5ef2f9906d16e04b19b38f73206e6a378 100644
--- a/src/core/SkPicturePlayback.cpp
+++ b/src/core/SkPicturePlayback.cpp
@@ -363,7 +363,11 @@ void SkPicturePlayback::handleOp(SkReader32* reader,
             const SkPath& path = fPictureData->getPath(reader);
             SkMatrix matrix;
             reader->readMatrix(&matrix);
-            canvas->drawTextOnPath(text.text(), text.length(), path, &matrix, paint);
+            SkCanvas::TextOnPathMethod method = SkCanvas::kStretch_TextOnPathMethod;
+            if (fPictureData->version() >= SkReadBuffer::kTextOnPathMethod_Version) {
+                method = (SkCanvas::TextOnPathMethod)reader->readInt();

[f(malita), 2015/02/16 15:31:50]

SkASSERT(method == ... || method == ...)?

+            }
+            canvas->drawTextOnPath(text.text(), text.length(), path, &matrix, method, paint);
         } break;
         case DRAW_VERTICES: {
             SkAutoTUnref<SkXfermode> xfer;