Implement vertex buffer caching in the tessellated path renderer.

src/core/SkPathPriv.h

Index: src/core/SkPathPriv.h
diff --git a/src/core/SkPathPriv.h b/src/core/SkPathPriv.h
index 934c730660427b6088a1f9681d2cee803c3dc096..51a1a8009479cd104680e7a80a85e075210ba0f6 100644
--- a/src/core/SkPathPriv.h
+++ b/src/core/SkPathPriv.h
@@ -59,6 +59,10 @@ public:
         int count = path.countVerbs();
         return count >= 1 && path.fPathRef->verbs()[~(count - 1)] == SkPath::Verb::kClose_Verb;
     }
+
+    static void AddGenIDChangeListener(const SkPath& path, SkPathRef::GenIDChangeListener* listener) {
+        path.fPathRef->addGenIDChangeListener(listener);
+    }
 };
 
 #endif