Bug 1324700 - Call PreTraverseSync() before calling ResolveStyleLazily() in ResolveTransientStyle(). r=heycam

MozReview-Commit-ID: 5KMELNYZJnq

--HG--
extra : rebase_source : 025a0d2267144bd631f28f554dba54352b13a43b

layout/style/ServoStyleSet.cpp

@@ -422,6 +422,8 @@ ServoStyleSet::ResolvePseudoElementStyle(Element* aOriginatingElement,
 already_AddRefed<nsStyleContext>
 ServoStyleSet::ResolveTransientStyle(Element* aElement, CSSPseudoElementType aType)
 {
+  PreTraverseSync();
+
   nsIAtom* pseudoTag = nullptr;
   if (aType != CSSPseudoElementType::NotPseudo) {
     pseudoTag = nsCSSPseudoElements::GetPseudoAtom(aType);