add Method param to drawTextOnPath, supporting SVG spec

src/core/SkPicturePlayback.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkPatchUtils.h"
 #include "SkPictureData.h"
@@ skipping 345 matching lines @@
                 canvas->drawText(text.text(), text.length(), ptr[0], ptr[1], paint);
             }
         } break;
         case DRAW_TEXT_ON_PATH: {
             const SkPaint& paint = *fPictureData->getPaint(reader);
             TextContainer text;
             get_text(reader, &text);
             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;
             const SkPaint& paint = *fPictureData->getPaint(reader);
             DrawVertexFlags flags = (DrawVertexFlags)reader->readInt();
             SkCanvas::VertexMode vmode = (SkCanvas::VertexMode)reader->readInt();
             int vCount = reader->readInt();
             const SkPoint* verts = (const SkPoint*)reader->skip(vCount * sizeof(SkPoint));
             const SkPoint* texs = NULL;
             const SkColor* colors = NULL;
@@ skipping 56 matching lines @@
         case TRANSLATE: {
             SkScalar dx = reader->readScalar();
             SkScalar dy = reader->readScalar();
             canvas->translate(dx, dy);
         } break;
         default:
             SkASSERTF(false, "Unknown draw type: %d", op);
     }
 }