Bug 1376248 - Part 1: Use an nsAutoAnimationMutationBatch when updating animations for an element in stylo. r=birtles

MozReview-Commit-ID: 2ft7qn9iVLB

--HG--
extra : rebase_source : b24eea2c4e08b448dcbc1891339a42d3534ddc2d

layout/style/ServoBindings.cpp

@@ -681,6 +681,8 @@ Gecko_UpdateAnimations(RawGeckoElementBorrowed aElement,
     return;
   }
 
+  nsAutoAnimationMutationBatch mb(aElement->OwnerDoc());
+
   CSSPseudoElementType pseudoType =
     GetPseudoTypeFromElementForAnimation(aElement);