diff -r 000000000000 -r 6474c204b198 mfbt/MemoryReporting.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mfbt/MemoryReporting.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* -*- 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/. */
+
+/* Memory reporting infrastructure. */
+
+#ifndef mozilla_MemoryReporting_h
+#define mozilla_MemoryReporting_h
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+
+namespace mozilla {
+
+/*
+ * This is for functions that are like malloc_usable_size.  Such functions are
+ * used for measuring the size of data structures.
+ */
+typedef size_t (*MallocSizeOf)(const void* p);
+
+} /* namespace mozilla */
+
+#endif /* __cplusplus */
+
+typedef size_t (*MozMallocSizeOf)(const void* p);
+
+#endif /* mozilla_MemoryReporting_h */