Pass the old and new owner documents to the adoptedCallback.

third_party/WebKit/Source/core/dom/custom/CustomElementAdoptedCallbackReaction.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CustomElementAdoptedCallbackReaction_h
 #define CustomElementAdoptedCallbackReaction_h
 
 #include "core/CoreExport.h"
 #include "core/dom/custom/CustomElementReaction.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
+class Document;
+
 class CORE_EXPORT CustomElementAdoptedCallbackReaction final
     : public CustomElementReaction {
     WTF_MAKE_NONCOPYABLE(CustomElementAdoptedCallbackReaction);
 public:
-    CustomElementAdoptedCallbackReaction(CustomElementDefinition*);
+    CustomElementAdoptedCallbackReaction(
+        CustomElementDefinition*, Document* oldOwner, Document* newOwner);
+
+    DECLARE_VIRTUAL_TRACE();
 
 private:
     void invoke(Element*) override;
+
+    Member<Document> m_oldOwner;
+    Member<Document> m_newOwner;
 };
 
 } // namespace blink
 
 #endif // CustomElementAdoptedCallbackReaction_h