cros: Fix DriveAppProvider racing during initialization.

chrome/browser/apps/drive/drive_app_provider.h

 // Copyright 2014 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_BROWSER_APPS_DRIVE_DRIVE_APP_PROVIDER_H_
 #define CHROME_BROWSER_APPS_DRIVE_DRIVE_APP_PROVIDER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 78 matching lines @@
   void OnExtensionUninstalled(content::BrowserContext* browser_context,
                               const extensions::Extension* extension,
                               extensions::UninstallReason reason) override;
 
   Profile* profile_;
   DriveAppUninstallSyncService* uninstall_sync_service_;
 
   scoped_ptr<DriveServiceBridge> service_bridge_;
   scoped_ptr<DriveAppMapping> mapping_;
   DriveAppInfos drive_apps_;
+  bool drive_app_registry_updated_;
 
   // Tracks the pending web app convertions.
   ScopedVector<DriveAppConverter> pending_converters_;
 
   base::WeakPtrFactory<DriveAppProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveAppProvider);
 };
 
 #endif  // CHROME_BROWSER_APPS_DRIVE_DRIVE_APP_PROVIDER_H_