From f2ac6fad96e5ff8d94d19558ae90bce6a02b2eac Mon Sep 17 00:00:00 2001
From: "L. David Baron" <dbaron@dbaron.org>
Date: Tue, 24 Nov 2015 17:45:01 -0800
Subject: [PATCH] Bug 1227501 patch 1 - Don't check flags for
 eCSSPropertyExtra_variable.  r=xidorn

I tested locally that the crashtest in patch 2 hits the fatal assertion
without this patch, and passes with the patch.

--HG--
extra : commitid : 8NwOfppKxBN
---
 layout/style/nsRuleNode.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/layout/style/nsRuleNode.cpp b/layout/style/nsRuleNode.cpp
index 206eb275bdf7..9d4c766b27d2 100644
--- a/layout/style/nsRuleNode.cpp
+++ b/layout/style/nsRuleNode.cpp
@@ -5945,6 +5945,7 @@ nsRuleNode::ComputeDisplayData(void* aStartStruct,
           nsCSSProps::LookupProperty(buffer,
                                      nsCSSProps::eEnabledForAllContent);
         if (prop != eCSSProperty_UNKNOWN &&
+            prop != eCSSPropertyExtra_variable &&
             nsCSSProps::PropHasFlags(prop,
                                      CSS_PROPERTY_CREATES_STACKING_CONTEXT))
         {