Bug 1371130: expose methods to get ::before, ::after, and the other NAC pseudos. r=heycam

MozReview-Commit-ID: JVeQevmjI3j

layout/style/ServoBindings.cpp

@@ -222,6 +222,37 @@ Gecko_GetDocumentElement(RawGeckoDocumentBorrowed aDoc)
   return aDoc->GetDocumentElement();
 }
 
+RawGeckoElementBorrowedOrNull
+Gecko_GetBeforeOrAfterPseudo(RawGeckoElementBorrowed aElement, bool aIsBefore)
+{
+  MOZ_ASSERT(aElement);
+  MOZ_ASSERT(aElement->HasProperties());
+
+  return aIsBefore
+    ? nsLayoutUtils::GetBeforePseudo(aElement)
+    : nsLayoutUtils::GetAfterPseudo(aElement);
+}
+
+nsTArray<nsIContent*>*
+Gecko_GetAnonymousContentForElement(RawGeckoElementBorrowed aElement)
+{
+  nsIAnonymousContentCreator* ac = do_QueryFrame(aElement->GetPrimaryFrame());
+  if (!ac) {
+    return nullptr;
+  }
+
+  auto* array = new nsTArray<nsIContent*>();
+  nsContentUtils::AppendNativeAnonymousChildren(aElement, *array, 0);
+  return array;
+}
+
+void
+Gecko_DestroyAnonymousContentList(nsTArray<nsIContent*>* aAnonContent)
+{
+  MOZ_ASSERT(aAnonContent);
+  delete aAnonContent;
+}
+
 StyleChildrenIteratorOwnedOrNull
 Gecko_MaybeCreateStyleChildrenIterator(RawGeckoNodeBorrowed aNode)
 {

layout/style/ServoBindings.h

@@ -136,6 +136,9 @@ RawGeckoElementBorrowedOrNull Gecko_GetFirstChildElement(RawGeckoElementBorrowed
 RawGeckoElementBorrowedOrNull Gecko_GetLastChildElement(RawGeckoElementBorrowed element);
 RawGeckoElementBorrowedOrNull Gecko_GetPrevSiblingElement(RawGeckoElementBorrowed element);
 RawGeckoElementBorrowedOrNull Gecko_GetNextSiblingElement(RawGeckoElementBorrowed element);
+RawGeckoElementBorrowedOrNull Gecko_GetBeforeOrAfterPseudo(RawGeckoElementBorrowed element, bool is_before);
+nsTArray<nsIContent*>* Gecko_GetAnonymousContentForElement(RawGeckoElementBorrowed element);
+void Gecko_DestroyAnonymousContentList(nsTArray<nsIContent*>* anon_content);
 RawGeckoElementBorrowedOrNull Gecko_GetDocumentElement(RawGeckoDocumentBorrowed document);
 void Gecko_LoadStyleSheet(mozilla::css::Loader* loader,
                           mozilla::ServoStyleSheet* parent,

layout/style/ServoBindings.toml

@@ -329,6 +329,7 @@ structs-types = [
     "mozilla::css::URLValue",
     "mozilla::MallocSizeOf",
     "mozilla::Side",
+    "nsIContent",
     "RawGeckoAnimationPropertySegment",
     "RawGeckoComputedTiming",
     "RawGeckoCSSPropertyIDList",