Expose Durable Storage API to script

Source/modules/quota/StorageManager.idl

Index: Source/modules/quota/StorageManager.idl
diff --git a/Source/modules/quota/StorageManager.idl b/Source/modules/quota/StorageManager.idl
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://storage.spec.whatwg.org/#storagemanager
+
+enum PersistentStoragePermission { "default", "denied", "granted" };

[mlamouri (slow - plz ping), 2015/08/04 13:15:19]

Why isn't that using PermissionState from the Permissions API?

[dgrogan, 2015/08/06 23:52:02]

I was hoping you and Anne figured that out during your F2F a while ago. I am
going by what is defined here
https://storage.spec.whatwg.org/#enumdef-persistentstoragepermission

[mlamouri (slow - plz ping), 2015/08/07 10:19:14]

He agreed to 'prompt' in the Permissions API. I'm surprised this API is still
using 'default'. I'm going to email him and CC you and jsbell@.

+
+[
+    Exposed=(Window,Worker),
+    TypeChecking=Interface,
+    GarbageCollected,
+    RuntimeEnabled=DurableStorage,
+] interface StorageManager {
+    [CallWith=ScriptState] Promise<PersistentStoragePermission> requestPersistent();
+    [CallWith=ScriptState] Promise<PersistentStoragePermission> persistentPermission();
+
+    // TODO(dgrogan): Implement estimate() and persistentEstimate().
+};