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diff --git a/dom/storage/PBackgroundStorage.ipdl b/dom/storage/PBackgroundStorage.ipdl
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+/* -*- 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 PBackground;
+
+include "mozilla/dom/quota/SerializationHelpers.h";
+
+using mozilla::OriginAttributesPattern
+ from "mozilla/OriginAttributes.h";
+
+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.
+ */
+[ManualDealloc, ChildImpl=virtual, ParentImpl=virtual]
+sync protocol PBackgroundStorage
+{
+ manager PBackground;
+
+parent:
+ async DeleteMe();
+
+ sync Preload(nsCString originSuffix,
+ nsCString originNoSuffix,
+ uint32_t alreadyLoadedCount)
+ returns (nsString[] keys, nsString[] values, nsresult rv);
+
+ async AsyncPreload(nsCString originSuffix, nsCString originNoSuffix,
+ bool priority);
+ async AsyncGetUsage(nsCString scope);
+ async AsyncAddItem(nsCString originSuffix, nsCString originNoSuffix,
+ nsString key, nsString value);
+ async AsyncUpdateItem(nsCString originSuffix, nsCString originNoSuffix,
+ nsString key, nsString value);
+ async AsyncRemoveItem(nsCString originSuffix, nsCString originNoSuffix,
+ nsString key);
+ async AsyncClear(nsCString originSuffix, nsCString originNoSuffix);
+ async AsyncFlush();
+
+ // These are privileged operations for use only by the observer API for
+ // delayed initialization and clearing origins and will never be used from
+ // content process children. Ideally these would be guarded by checks or
+ // exist on a separate, privileged interface, but PBackgroundStorage is
+ // already insecure.
+ async Startup();
+ async ClearAll();
+ async ClearMatchingOrigin(nsCString originNoSuffix);
+ async ClearMatchingOriginAttributes(OriginAttributesPattern pattern);
+
+child:
+ async __delete__();
+
+ async Observe(nsCString topic,
+ nsString originAttributesPattern,
+ nsCString originScope);
+ async OriginsHavingData(nsCString[] origins);
+ async LoadItem(nsCString originSuffix, nsCString originNoSuffix, nsString key,
+ nsString value);
+ async LoadDone(nsCString originSuffix, nsCString originNoSuffix, nsresult rv);
+ async LoadUsage(nsCString scope, int64_t usage);
+ async Error(nsresult rv);
+};
+
+}
+}