Ensure sync footer visibility is always set correctly.

chrome/browser/ui/webui/welcome_handler_android.h

 // Copyright (c) 2013 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_WELCOME_HANDLER_ANDROID_H_
 #define CHROME_BROWSER_UI_WEBUI_WELCOME_HANDLER_ANDROID_H_
 
 #include "base/scoped_observer.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/profile_sync_service_observer.h"
@@ skipping 22 matching lines @@
   void HandleShowSyncSettings(const ListValue* args);
 
   // Callback for the "showTermsOfService" message. This opens the terms of
   // service popup.
   void HandleShowTermsOfService(const ListValue* args);
 
   // ProfileSyncServiceObserver implementation
   virtual void OnStateChanged() OVERRIDE;
 
  private:
+  // Update the sync footer visibility. Set |forced| if you want to force to
+  // send an update to the renderer regardless of whether we assume the state
+  // is up to date or not.
+  void UpdateSyncFooterVisibility(bool forced);
+
   // Cached pointer to the sync service for this profile.
   ProfileSyncService* sync_service_;
 
   ScopedObserver<ProfileSyncService, WelcomeHandler> observer_manager_;
 
   // Whether the sync footer is visible on the page.
   bool is_sync_footer_visible_;
 
   DISALLOW_COPY_AND_ASSIGN(WelcomeHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_WELCOME_HANDLER_ANDROID_H_