diff -r 000000000000 -r 6474c204b198 xpcom/build/NSPRInterposer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/build/NSPRInterposer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* 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 NSPRINTERPOSER_H_
+#define NSPRINTERPOSER_H_
+
+namespace mozilla {
+
+/**
+ * Initialize IO interposing for NSPR. This will report NSPR read, writes and
+ * fsyncs to the IOInterposerObserver. It is only safe to call this from the
+ * main-thread when no other threads are running.
+ */
+void InitNSPRIOInterposing();
+
+/**
+ * Removes interception of NSPR IO methods as setup by InitNSPRIOInterposing.
+ * Note, that it is only safe to call this on the main-thread when all other
+ * threads have stopped. Which is typically the case at shutdown.
+ */
+void ClearNSPRIOInterposing();
+
+} // namespace mozilla
+
+#endif // NSPRINTERPOSER_H_