Don't update DisplayLists when dumping

bug:22234438

Updating the displaylist is invalid since this debug method isn't
called on the UI thread, and it defeats the purpose of seeing what
the hierarchy is currently rendering.

Change-Id: I10c5cc6dbae8d304559dfc6e863b0ede158d554f
diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index 6d0d788..34d3b0e 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -2367,8 +2367,7 @@
      * @hide
      */
     void outputDisplayList(View view) {
-        RenderNode renderNode = view.updateDisplayListIfDirty();
-        renderNode.output();
+        view.mRenderNode.output();
     }
 
     /**