Bug 1097499 part 3 - Add a separate anonbox for text nodes. r=heycam

MozReview-Commit-ID: 1GfoFEGhyka

layout/style/nsStyleSet.cpp

@@ -1781,12 +1781,12 @@ nsStyleSet::ResolveStyleWithoutAnimation(dom::Element* aTarget,
 }
 
 already_AddRefed<nsStyleContext>
-nsStyleSet::ResolveStyleForNonElement(nsStyleContext* aParentContext)
+nsStyleSet::ResolveStyleForNonElement(nsStyleContext* aParentContext,
+                                      nsIAtom* aPseudoTag)
 {
-  return GetContext(aParentContext, mRuleTree, nullptr,
-                    nsCSSAnonBoxes::mozNonElement,
-                    CSSPseudoElementType::AnonBox, nullptr,
-                    eNoFlags);
+  MOZ_ASSERT(nsCSSAnonBoxes::IsNonElement(aPseudoTag));
+  return GetContext(aParentContext, mRuleTree, nullptr, aPseudoTag,
+                    CSSPseudoElementType::AnonBox, nullptr, eNoFlags);
 }
 
 void