Adds async interface method to PersistentPrefStore.

content/common/notification_type.h

 // Copyright (c) 2011 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.
 
 #ifndef CONTENT_COMMON_NOTIFICATION_TYPE_H_
 #define CONTENT_COMMON_NOTIFICATION_TYPE_H_
 #pragma once
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
@@ skipping 728 matching lines @@
     WEB_APP_INSTALL_CHANGED,
 
     // This is sent to a pref observer when a pref is changed. The source is the
     // PrefService and the details a std::string of the changed path.
     PREF_CHANGED,
 
     // This is broadcast after the preference subsystem has completed
     // asynchronous initalization of a PrefService.
     PREF_INITIALIZATION_COMPLETED,
 
+    // This is broadcast after the preference subsystem has failed to load a
+    // PrefService.
+    PREF_INITIALIZATION_FAILED,

[Mattias Nissler (ping if slow), 2011/04/27 12:16:30]

As mention elsewhere, I think it's much better to pass a Details parameter
instead.

[altimofeev, 2011/05/04 13:46:14]

Done.

+
     // Sent when a default request context has been created, so calling
     // Profile::GetDefaultRequestContext() will not return NULL.  This is sent
     // on the thread where Profile::GetRequestContext() is first called, which
     // should be the UI thread.
     DEFAULT_REQUEST_CONTEXT_AVAILABLE,
 
     // The state of a web resource has been changed. A resource may have been
     // added, removed, or altered. Source is WebResourceService, and the
     // details are NoDetails.
     PROMO_RESOURCE_STATE_CHANGED,
@@ skipping 581 matching lines @@
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CONTENT_COMMON_NOTIFICATION_TYPE_H_