Compact the clipstack for kReplace_Op'd geometry

include/core/SkClipStack.h

Index: include/core/SkClipStack.h
diff --git a/include/core/SkClipStack.h b/include/core/SkClipStack.h
index 256f603962d5b2358506c5f71898b9f69f1c7596..145552dc13aca12b5cc1fd19404896379eb0f6b2 100644
--- a/include/core/SkClipStack.h
+++ b/include/core/SkClipStack.h
@@ -453,6 +453,11 @@ private:
     mutable SkTDArray<ClipCallbackData> fCallbackData;
 
     /**
+     * Restore the stack back to the specified save count.
+     */
+    void restoreTo(int saveCount);
+
+    /**
      * Invoke all the purge callbacks passing in element's generation ID.
      */
     void purgeClip(Element* element);