Implement vertex buffer caching in the tessellated path renderer.

include/core/SkPath.h

Index: include/core/SkPath.h
diff --git a/include/core/SkPath.h b/include/core/SkPath.h
index fe89766558c4ab5be1710f10f17d6ddc7f8b843b..f534c63b872d0ecb1c43af9c8f68d806b90b23b2 100644
--- a/include/core/SkPath.h
+++ b/include/core/SkPath.h
@@ -1000,11 +1000,14 @@ private:
 
     void setPt(int index, SkScalar x, SkScalar y);
 
+    SkPathRef* pathRef() const { return fPathRef; }
+
     friend class SkAutoPathBoundsUpdate;
     friend class SkAutoDisableOvalCheck;
     friend class SkAutoDisableDirectionCheck;
     friend class SkBench_AddPathTest; // perf test reversePathTo
     friend class PathTest_Private; // unit test reversePathTo
+    friend class TessellatingPathBatch; // for pathRef()
 };
 
 #endif