diff -r 000000000000 -r 6474c204b198 xpcom/base/nsMemoryImpl.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/base/nsMemoryImpl.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 nsMemoryImpl_h__
+#define nsMemoryImpl_h__
+
+#include "mozilla/Atomics.h"
+
+#include "nsIMemory.h"
+#include "nsIRunnable.h"
+
+// nsMemoryImpl is a static object. We can do this because it doesn't have
+// a constructor/destructor or any instance members. Please don't add
+// instance member variables, only static member variables.
+
+class nsMemoryImpl : public nsIMemory
+{
+public:
+    // We don't use the generic macros because we are a special static object
+    NS_IMETHOD QueryInterface(REFNSIID aIID, void** aResult);
+    NS_IMETHOD_(MozExternalRefCountType) AddRef(void) { return 1; }
+    NS_IMETHOD_(MozExternalRefCountType) Release(void) { return 1; }
+
+    NS_DECL_NSIMEMORY
+
+    static nsresult Create(nsISupports* outer,
+                           const nsIID& aIID, void **aResult);
+
+    NS_HIDDEN_(nsresult) FlushMemory(const char16_t* aReason, bool aImmediate);
+    NS_HIDDEN_(nsresult) RunFlushers(const char16_t* aReason);
+
+protected:
+    struct FlushEvent : public nsIRunnable {
+        NS_DECL_ISUPPORTS_INHERITED
+        NS_DECL_NSIRUNNABLE
+        const char16_t* mReason;
+    };
+
+    static mozilla::Atomic<bool> sIsFlushing;
+    static FlushEvent sFlushEvent;
+    static PRIntervalTime sLastFlushTime;
+};
+
+#endif // nsMemoryImpl_h__