Trigger chrome.storage.onChanged events for policy updates on the 'managed' namespace.

chrome/browser/extensions/settings/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_SETTINGS_VALUE_STORE_CACHE_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_VALUE_STORE_CACHE_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop_proxy.h"
 
 class ValueStore;
 
 namespace extensions {
 
 class Extension;
 
 // Each namespace of the storage API implements this interface.
 // Instances are created on the UI thread, but from then on live on the loop
-// returned by GetMessageLoop() and every methods (except GetMessageLoop())
-// are always called in that loop, including the destructor.
+// returned by GetMessageLoop() and every method (except GetMessageLoop()
+// and ShutdownOnUI()) is always called in that loop, including the destructor.
 class ValueStoreCache {
  public:
   typedef base::Callback<void(ValueStore*)> StorageCallback;
 
   virtual ~ValueStoreCache();
 
+  // This is invoked from the UI thread during destruction of the Profile that
+  // ultimately owns this object. Any Profile-related cleanups should be
+  // performed in this method, since the destructor will execute later, after
+  // the Profile is already gone.
+  virtual void ShutdownOnUI();
+
   // Returns the loop that the methods of this class should be invoked on.
   virtual scoped_refptr<base::MessageLoopProxy> GetMessageLoop() const = 0;
 
   // Requests the cache to invoke |callback| with the appropriate ValueStore
   // for the given |extension|. |callback| should be invoked with a NULL
   // ValueStore in case of errors.
   // |extension| is passed in a scoped_refptr<> because this method is
   // asynchronously posted as a task to the loop returned by GetMessageLoop(),
   // and this guarantees the Extension is still valid when the method executes.
   virtual void RunWithValueStoreForExtension(
       const StorageCallback& callback,
       scoped_refptr<const Extension> extension) = 0;
 
   // Requests the cache to delete any storage used by |extension_id|.
   virtual void DeleteStorageSoon(const std::string& extension_id) = 0;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_VALUE_STORE_CACHE_H_