[Hotword] Sync Audio History pref every 24 hours, when opening chrome://settings and . . .

chrome/browser/ui/webui/options/browser_options_handler.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_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 267 matching lines @@
 
 #if defined(ENABLE_PRINT_PREVIEW)
   // Register localized values used by Cloud Print
   void RegisterCloudPrintValues(base::DictionaryValue* values);
 #endif
 
   // Check if hotword is available. If it is, tell the javascript to show
   // the hotword section of the settings page.
   void SendHotwordAvailable();
 
+  // Callback that updates the visibility of the audio history upon completion
+  // of a call to the server to the get the current value.
+  void SetHotwordAudioHistorySectionVisible(
+      bool always_on,
+      const base::string16& audio_history_state,
+      bool success,
+      bool logging_enabled);
+
   // Callback for "requestHotwordAvailable" message.
   void HandleRequestHotwordAvailable(const base::ListValue* args);
 
   // Callback for "launchHotwordAudioVerificationApp" message.
   void HandleLaunchHotwordAudioVerificationApp(const base::ListValue* args);
 
   // Callback for "launchEasyUnlockSetup" message.
   void HandleLaunchEasyUnlockSetup(const base::ListValue* args);
 
   // Callback for "refreshExtensionControlIndicators" message.
@@ skipping 94 matching lines @@
 
   // Used to get WeakPtr to self for use on the UI thread.
   base::WeakPtrFactory<BrowserOptionsHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserOptionsHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_