diff -r 000000000000 -r 6474c204b198 widget/cocoa/nsMenuGroupOwnerX.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/cocoa/nsMenuGroupOwnerX.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMenuGroupOwnerX_h_
+#define nsMenuGroupOwnerX_h_
+
+#import <Cocoa/Cocoa.h>
+
+#include "nsMenuBaseX.h"
+#include "nsIMutationObserver.h"
+#include "nsHashKeys.h"
+#include "nsDataHashtable.h"
+#include "nsAutoPtr.h"
+#include "nsString.h"
+
+
+class nsMenuX;
+class nsMenuItemX;
+class nsChangeObserver;
+class nsIWidget;
+class nsIContent;
+class nsIDocument;
+
+class nsMenuGroupOwnerX : public nsMenuObjectX, public nsIMutationObserver
+{
+public:
+  nsMenuGroupOwnerX();
+  virtual ~nsMenuGroupOwnerX();
+
+  nsresult Create(nsIContent * aContent);
+
+  void RegisterForContentChanges(nsIContent* aContent,
+                                 nsChangeObserver* aMenuObject);
+  void UnregisterForContentChanges(nsIContent* aContent);
+  uint32_t RegisterForCommand(nsMenuItemX* aItem);
+  void UnregisterCommand(uint32_t aCommandID);
+  nsMenuItemX* GetMenuItemForCommandID(uint32_t inCommandID);
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMUTATIONOBSERVER
+
+protected:
+  nsChangeObserver* LookupContentChangeObserver(nsIContent* aContent);
+
+  uint32_t  mCurrentCommandID;  // unique command id (per menu-bar) to
+                                // give to next item that asks
+  nsIDocument* mDocument;       // pointer to document
+
+  // stores observers for content change notification
+  nsDataHashtable<nsPtrHashKey<nsIContent>, nsChangeObserver *> mContentToObserverTable;
+
+  // stores mapping of command IDs to menu objects
+  nsDataHashtable<nsUint32HashKey, nsMenuItemX *> mCommandToMenuObjectTable;
+};
+
+#endif // nsMenuGroupOwner_h_