Fix root RenderNode damage calculation

 Bug: 15888445

Change-Id: I281ec9271c9889673dcdfcb6d31e341a7b47b7de
diff --git a/libs/hwui/RenderNode.h b/libs/hwui/RenderNode.h
index 54fa143..8cc65b2 100644
--- a/libs/hwui/RenderNode.h
+++ b/libs/hwui/RenderNode.h
@@ -173,9 +173,6 @@
     // UI thread only!
     ANDROID_API void addAnimator(const sp<BaseRenderNodeAnimator>& animator);
 
-protected:
-    virtual void damageSelf(TreeInfo& info);
-
 private:
     typedef key_value_pair_t<float, DrawRenderNodeOp*> ZDrawRenderNodeOpPair;
 
@@ -250,6 +247,7 @@
     void prepareLayer(TreeInfo& info);
     void pushLayerUpdate(TreeInfo& info);
     void deleteDisplayListData();
+    void damageSelf(TreeInfo& info);
 
     void incParentRefCount() { mParentCount++; }
     void decParentRefCount();