diff -r 000000000000 -r 6474c204b198 dom/src/storage/PStorage.ipdl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/src/storage/PStorage.ipdl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
+/* vim: set sw=4 ts=8 et tw=80 ft=cpp : */
+/* 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 PContent;
+
+namespace mozilla {
+namespace dom {
+
+/* This protocol bridges async access to the database thread running on the parent process
+ * and caches running on the child process.
+ */
+sync protocol PStorage
+{
+  manager PContent;
+
+parent:
+  async __delete__();
+
+  sync  Preload(nsCString scope, uint32_t alreadyLoadedCount)
+    returns (nsString[] keys, nsString[] values, nsresult rv);
+
+  async AsyncPreload(nsCString scope, bool priority);
+  async AsyncGetUsage(nsCString scope);
+  async AsyncAddItem(nsCString scope, nsString key, nsString value);
+  async AsyncUpdateItem(nsCString scope, nsString key, nsString value);
+  async AsyncRemoveItem(nsCString scope, nsString key);
+  async AsyncClear(nsCString scope);
+  async AsyncFlush();
+  
+child:
+  async Observe(nsCString topic, nsCString scopePrefix);
+  async ScopesHavingData(nsCString[] scopes);
+  async LoadItem(nsCString scope, nsString key, nsString value);
+  async LoadDone(nsCString scope, nsresult rv);
+  async LoadUsage(nsCString scope, int64_t usage);
+  async Error(nsresult rv);
+};
+
+}
+}