diff -r 000000000000 -r 6474c204b198 dom/src/storage/DOMStorageObserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/src/storage/DOMStorageObserver.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+/* -*- 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 nsIDOMStorageObserver_h__
+#define nsIDOMStorageObserver_h__
+
+#include "nsIObserver.h"
+#include "nsITimer.h"
+#include "nsWeakReference.h"
+#include "nsTArray.h"
+#include "nsString.h"
+
+namespace mozilla {
+namespace dom {
+
+class DOMStorageObserver;
+
+// Implementers are DOMStorageManager and DOMStorageDBParent to forward to
+// child processes.
+class DOMStorageObserverSink
+{
+public:
+  virtual ~DOMStorageObserverSink() {}
+
+private:
+  friend class DOMStorageObserver;
+  virtual nsresult Observe(const char* aTopic, const nsACString& aScopePrefix) = 0;
+};
+
+// Statically (though layout statics) initialized observer receiving and processing
+// chrome clearing notifications, such as cookie deletion etc.
+class DOMStorageObserver : public nsIObserver
+                         , public nsSupportsWeakReference
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  virtual ~DOMStorageObserver() {}
+
+  static nsresult Init();
+  static nsresult Shutdown();
+  static DOMStorageObserver* Self() { return sSelf; }
+
+  void AddSink(DOMStorageObserverSink* aObs);
+  void RemoveSink(DOMStorageObserverSink* aObs);
+  void Notify(const char* aTopic, const nsACString& aData = EmptyCString());
+
+private:
+  static DOMStorageObserver* sSelf;
+
+  // Weak references
+  nsTArray<DOMStorageObserverSink*> mSinks;
+  nsCOMPtr<nsITimer> mDBThreadStartDelayTimer;
+};
+
+} // ::dom
+} // ::mozilla
+
+#endif