From 41698e7923a4a10e3f0886e5761923591c2f3364 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Naz=C4=B1m=20Can=20Alt=C4=B1nova?= <canaltinova@gmail.com>
Date: Sun, 6 Aug 2017 22:35:22 -0700
Subject: [PATCH] Implement ToAnimatedZero for MozLength

---
 .../style/properties/helpers/animated_properties.mako.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/components/style/properties/helpers/animated_properties.mako.rs b/components/style/properties/helpers/animated_properties.mako.rs
index 4419e2921fe..d6e20b26cce 100644
--- a/components/style/properties/helpers/animated_properties.mako.rs
+++ b/components/style/properties/helpers/animated_properties.mako.rs
@@ -1364,7 +1364,14 @@ impl Animatable for MozLength {
 
 impl ToAnimatedZero for MozLength {
     #[inline]
-    fn to_animated_zero(&self) -> Result<Self, ()> { Err(()) }
+    fn to_animated_zero(&self) -> Result<Self, ()> {
+        match *self {
+            MozLength::LengthOrPercentageOrAuto(ref length) => {
+                Ok(MozLength::LengthOrPercentageOrAuto(length.to_animated_zero()?))
+            },
+            _ => Err(())
+        }
+    }
 }
 
 /// https://drafts.csswg.org/css-transitions/#animtype-lpcalc