1 files changed, 14 insertions, 1 deletions
diff --git a/dom/base/CustomElementRegistry.h b/dom/base/CustomElementRegistry.h
index ff803a054..9034dd7ea 100644
--- a/dom/base/CustomElementRegistry.h
+++ b/dom/base/CustomElementRegistry.h
@@ -7,13 +7,14 @@
 #ifndef mozilla_dom_CustomElementRegistry_h
 #define mozilla_dom_CustomElementRegistry_h
 
+#include "js/GCHashTable.h"
 #include "js/TypeDecls.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/ErrorResult.h"
 #include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/FunctionBinding.h"
 #include "nsCycleCollectionParticipant.h"
 #include "nsWrapperCache.h"
-#include "mozilla/dom/FunctionBinding.h"
 
 class nsDocument;
 
@@ -173,6 +174,8 @@ private:
   explicit CustomElementRegistry(nsPIDOMWindowInner* aWindow);
   ~CustomElementRegistry();
 
+  bool Init();
+
   /**
    * Registers an unresolved custom element that is a candidate for
    * upgrade when the definition is registered via registerElement.
@@ -192,15 +195,25 @@ private:
     DefinitionMap;
   typedef nsClassHashtable<nsISupportsHashKey, nsTArray<nsWeakPtr>>
     CandidateMap;
+  typedef JS::GCHashMap<JS::Heap<JSObject*>,
+                        nsCOMPtr<nsIAtom>,
+                        js::MovableCellHasher<JS::Heap<JSObject*>>,
+                        js::SystemAllocPolicy> ConstructorMap;
 
   // Hashtable for custom element definitions in web components.
   // Custom prototypes are stored in the compartment where
   // registerElement was called.
   DefinitionMap mCustomDefinitions;
 
+  // Hashtable for looking up definitions by using constructor as key.
+  // Custom elements' name are stored here and we need to lookup
+  // mCustomDefinitions again to get definitions.
+  ConstructorMap mConstructors;
+
   typedef nsRefPtrHashtable<nsISupportsHashKey, Promise>
     WhenDefinedPromiseMap;
   WhenDefinedPromiseMap mWhenDefinedPromiseMap;
+
   // The "upgrade candidates map" from the web components spec. Maps from a
   // namespace id and local name to a list of elements to upgrade if that
   // element is registered as a custom element.