[cros] Update wallpaper when displaying Gaia frame.

chrome/browser/chromeos/login/wallpaper_manager.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/wallpaper_manager.h"
 
 #include <vector>
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/desktop_background/desktop_background_resources.h"
@@ skipping 663 matching lines @@
       }
       return;
     }
     ash::Shell::GetInstance()->desktop_background_controller()->
         SetDefaultWallpaper(index, false);
     if (!new_wallpaper_ui_disabled)
       MigrateBuiltInWallpaper(email);
   }
 }
 
+void WallpaperManager::SetSigninWallpaper() {
+  ash::Shell::GetInstance()->desktop_background_controller()->
+      SetDefaultWallpaper(kDefaultOOBEWallpaperIndex, false);
+}
+
 void WallpaperManager::SetWallpaperFromImageSkia(
     const gfx::ImageSkia& wallpaper,
     ash::WallpaperLayout layout) {
   ash::Shell::GetInstance()->desktop_background_controller()->
       SetCustomWallpaper(wallpaper, layout);
 }
 
-void WallpaperManager::OnUserSelected(const std::string& email) {
-  SetUserWallpaper(email);
-}
-
 // WallpaperManager, private: --------------------------------------------------
 
 WallpaperManager::~WallpaperManager() {
   DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
   system::TimezoneSettings::GetInstance()->RemoveObserver(this);
   weak_factory_.InvalidateWeakPtrs();
 }
 
 void WallpaperManager::BatchUpdateWallpaper() {
   PrefService* local_state = g_browser_process->local_state();
@@ skipping 555 matching lines @@
                           FROM_HERE,
                           base::Bind(&WallpaperManager::StartLoad,
                                      base::Unretained(this),
                                      email,
                                      info,
                                      update_wallpaper,
                                      valid_path));
 }
 
 }  // chromeos