From: L. David Baron <dbaron@dbaron.org>

Bug 828312, patch 2:  Expose ElementRestyler::mHintsNotHandledForDescendants back to its caller.

diff --git a/layout/base/RestyleManager.h b/layout/base/RestyleManager.h
--- a/layout/base/RestyleManager.h
+++ b/layout/base/RestyleManager.h
@@ -313,16 +313,19 @@ public:
    * mHintsHandled changes over time; it starts off as the hints that
    * have been handled by ancestors, and by the end of Restyle it
    * represents the hints that have been handled for this frame.  This
    * method is intended to be called after Restyle, to find out what
    * hints have been handled for this frame.
    */
   nsChangeHint HintsHandledForFrame() { return mHintsHandled; }
 
+  nsChangeHint HintsNotHandledForDescendants()
+    { return mHintsNotHandledForDescendants; }
+
 private:
   /**
    * First half of Restyle().
    */
   void RestyleSelf(nsRestyleHint aRestyleHint);
 
   /**
    * Restyle the children of this frame (and, in turn, their children).