Bug 856140 - Sync our document.registerElement implementation to the current version of the spec. r=mrbkap

content/base/src/FragmentOrElement.cpp

@@ -563,6 +563,12 @@ FragmentOrElement::nsDOMSlots::Traverse(nsCycleCollectionTraversalCallback &cb,
 
   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mClassList");
   cb.NoteXPCOMChild(mClassList.get());
+
+  if (mCustomElementData) {
+    for (uint32_t i = 0; i < mCustomElementData->mCallbackQueue.Length(); i++) {
+      mCustomElementData->mCallbackQueue[i]->Traverse(cb);
+    }
+  }
 }
 
 void
@@ -582,6 +588,7 @@ FragmentOrElement::nsDOMSlots::Unlink(bool aIsXUL)
   mContainingShadow = nullptr;
   mChildrenList = nullptr;
   mUndoManager = nullptr;
+  mCustomElementData = nullptr;
   if (mClassList) {
     mClassList->DropReference();
     mClassList = nullptr;
@@ -1013,6 +1020,24 @@ FragmentOrElement::SetXBLInsertionParent(nsIContent* aContent)
   slots->mXBLInsertionParent = aContent;
 }
 
+CustomElementData*
+FragmentOrElement::GetCustomElementData() const
+{
+  nsDOMSlots *slots = GetExistingDOMSlots();
+  if (slots) {
+    return slots->mCustomElementData;
+  }
+  return nullptr;
+}
+
+void
+FragmentOrElement::SetCustomElementData(CustomElementData* aData)
+{
+  nsDOMSlots *slots = DOMSlots();
+  MOZ_ASSERT(!slots->mCustomElementData, "Custom element data may not be changed once set.");
+  slots->mCustomElementData = aData;
+}
+
 nsresult
 FragmentOrElement::InsertChildAt(nsIContent* aKid,
                                 uint32_t aIndex,