Adds async interface method to PersistentPrefStore.

chrome/common/persistent_pref_store.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 CHROME_COMMON_PERSISTENT_PREF_STORE_H_
 #define CHROME_COMMON_PERSISTENT_PREF_STORE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 44 matching lines @@
   virtual void SetValueSilently(const std::string& key, Value* value) = 0;
 
   // Removes the value for |key|.
   virtual void RemoveValue(const std::string& key) = 0;
 
   // Whether the store is in a pseudo-read-only mode where changes are not
   // actually persisted to disk.  This happens in some cases when there are
   // read errors during startup.
   virtual bool ReadOnly() const = 0;
 
-  // Reads the preferences from disk.
+  // Reads the preferences from disk. Notifies observers via
+  // "OnInitializationCompleted" when done.

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

Maybe write PrefStore::Observer::OnInitializationCompleted to make it a bit
clearer? Also below.

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

Done.

   virtual PrefReadError ReadPrefs() = 0;
 
+  // Reads the preferences from disk asynchronously. Notifies observers via
+  // "OnInitializationCompleted" when done.
+  virtual void ReadPrefsAsync() = 0;
+
+  // Returns reading error and whether the error is fatal.
+  virtual void GetErrors(PrefReadError* error, bool* is_fatal) = 0;
+
   // Writes the preferences to disk immediately.
   virtual bool WritePrefs() = 0;
 
   // Schedules an asynchronous write operation.
   virtual void ScheduleWritePrefs() = 0;
 
   // Lands any pending writes to disk.
   virtual void CommitPendingWrite() = 0;
 };
 
 #endif  // CHROME_COMMON_PERSISTENT_PREF_STORE_H_