use common impl for drawTextOnPath

include/core/SkDevice.h

Index: include/core/SkDevice.h
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 9f3ac580080590c36989f4a657040e6a79092317..777b7f8fd7bf786de5d30136eab5b0b8ab4f9ebe 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -218,9 +218,6 @@ protected:
     virtual void drawPosText(const SkDraw&, const void* text, size_t len,
                              const SkScalar pos[], int scalarsPerPos,
                              const SkPoint& offset, const SkPaint& paint) = 0;
-    virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len,
-                                const SkPath& path, const SkMatrix* matrix,
-                                const SkPaint& paint) = 0;
     virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, int vertexCount,
                               const SkPoint verts[], const SkPoint texs[],
                               const SkColor colors[], SkXfermode* xmode,
@@ -238,6 +235,8 @@ protected:
     virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
                             const SkPaint&) = 0;
 
+    virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len, const SkPath&,
+                                const SkMatrix*, const SkPaint&);
     bool readPixels(const SkImageInfo&, void* dst, size_t rowBytes, int x, int y);
 
     ///////////////////////////////////////////////////////////////////////////