diff -r 000000000000 -r 6474c204b198 dom/plugins/ipc/PPluginIdentifier.ipdl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/ipc/PPluginIdentifier.ipdl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
+/* 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/. */
+
+include protocol PPluginModule;
+
+namespace mozilla {
+namespace plugins {
+
+/**
+ * Represents an NPIdentifier that wraps either a string or an integer.
+ */
+async protocol PPluginIdentifier
+{
+  manager PPluginModule;
+
+parent:
+  /**
+   * If this is a temporary identifier, inform the parent that the plugin
+   * has made the identifier permanent by calling NPN_GetStringIdentifier.
+   */
+  async Retain();
+
+child:
+  async __delete__();
+};
+
+} // namespace plugins
+} // namespace mozilla