Fixes and improvements to cloud policy for extensions.

chrome/browser/extensions/api/storage/managed_value_store_cache.h

 // Copyright (c) 2012 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_EXTENSIONS_API_STORAGE_MANAGED_VALUE_STORE_CACHE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_STORAGE_MANAGED_VALUE_STORE_CACHE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 54 matching lines @@
                                const policy::PolicyMap& current) OVERRIDE;
 
   // Posted by OnPolicyUpdated() to update a PolicyValueStore on the FILE
   // thread.
   void UpdatePolicyOnFILE(const std::string& extension_id,
                           scoped_ptr<policy::PolicyMap> current_policy);
 
   // Returns an existing PolicyValueStore for |extension_id|, or NULL.
   PolicyValueStore* GetStoreFor(const std::string& extension_id);
 
+  // Returns true if a backing store has been created for |extension_id|.
+  bool HasStore(const std::string& extension_id) const;
+
   // The profile that owns the extension system being used. This is used to
   // get the PolicyService, the EventRouter and the ExtensionService.
   Profile* profile_;
 
   // The |profile_|'s PolicyService.
   policy::PolicyService* policy_service_;
 
   // Observes extension loading and unloading, and keeps the Profile's
   // PolicyService aware of the current list of extensions.
   scoped_ptr<ExtensionTracker> extension_tracker_;
 
   // These live on the FILE thread.
   scoped_refptr<SettingsStorageFactory> storage_factory_;
   scoped_refptr<SettingsObserverList> observers_;
   base::FilePath base_path_;
 
   // All the PolicyValueStores live on the FILE thread, and |store_map_| can be
   // accessed only on the FILE thread as well.
   PolicyValueStoreMap store_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagedValueStoreCache);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_STORAGE_MANAGED_VALUE_STORE_CACHE_H_