diff -r 000000000000 -r 6474c204b198 xpcom/base/nsMemoryInfoDumper.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/base/nsMemoryInfoDumper.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 mozilla_nsMemoryInfoDumper_h
+#define mozilla_nsMemoryInfoDumper_h
+
+#include "nsIMemoryInfoDumper.h"
+
+class nsACString;
+
+/**
+ * This class facilitates dumping information about our memory usage to disk.
+ *
+ * Its cpp file also has Linux-only code which watches various OS signals and
+ * dumps memory info upon receiving a signal.  You can activate these listeners
+ * by calling Initialize().
+ */
+class nsMemoryInfoDumper : public nsIMemoryInfoDumper
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMEMORYINFODUMPER
+
+  nsMemoryInfoDumper();
+  virtual ~nsMemoryInfoDumper();
+
+public:
+  static void Initialize();
+
+#ifdef MOZ_DMD
+  static nsresult DumpDMD(const nsAString &aIdentifier);
+#endif
+};
+
+#define NS_MEMORY_INFO_DUMPER_CID \
+{ 0x00bd71fb, 0x7f09, 0x4ec3, \
+{ 0x96, 0xaf, 0xa0, 0xb5, 0x22, 0xb7, 0x79, 0x69 } }
+
+#endif