Bug 576055 - MayHavePaintEventListener fails for e10s message manager. This was part of bug 549223, but somehow it was lost in a merge. r=dougt

layout/base/nsPresContext.cpp

@@ -2092,7 +2092,12 @@ MayHavePaintEventListener(nsPIDOMWindow* aInnerWindow)
   if (window)
     return MayHavePaintEventListener(window);
 
-  return PR_FALSE;
+  nsCOMPtr<nsPIWindowRoot> root = do_QueryInterface(parentTarget);
+  nsPIDOMEventTarget* tabChildGlobal;
+  return root &&
+         (tabChildGlobal = root->GetParentTarget()) &&
+         (manager = tabChildGlobal->GetListenerManager(PR_FALSE)) &&
+         manager->MayHavePaintEventListener();
 }
 
 PRBool