From 4cc5717116852ddd544306d7e486511780ec2477 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Thu, 8 Feb 2018 12:29:11 +0100
Subject: [PATCH] style: Save some work if the origin is not dirty.

MozReview-Commit-ID: EGHztVLj9i3
---
 components/style/stylist.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/style/stylist.rs b/components/style/stylist.rs
index 42f210d0325..6494b4f35b6 100644
--- a/components/style/stylist.rs
+++ b/components/style/stylist.rs
@@ -240,6 +240,10 @@ impl DocumentCascadeData {
     {
         debug_assert_ne!(origin, Origin::UserAgent);
 
+        if !flusher.origin_dirty(origin) {
+            return Ok(());
+        }
+
         let validity = flusher.data_validity(origin);
 
         match validity {