Asynchronously load wallpapers when user pod is selected.

chrome/browser/chromeos/chrome_browser_main_chromeos.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/chrome_browser_main_chromeos.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/chromeos/chromeos_version.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
 #include "chrome/browser/browser_process_impl.h"
 #include "chrome/browser/chromeos/audio/audio_handler.h"
-#include "chrome/browser/chromeos/background/desktop_background_observer.h"
 #include "chrome/browser/chromeos/boot_times_loader.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cryptohome/async_method_caller.h"
 #include "chrome/browser/chromeos/dbus/cros_dbus_service.h"
 #include "chrome/browser/chromeos/disks/disk_mount_manager.h"
 #include "chrome/browser/chromeos/external_metrics.h"
 #include "chrome/browser/chromeos/imageburner/burn_manager.h"
 #include "chrome/browser/chromeos/input_method/input_method_manager.h"
 #include "chrome/browser/chromeos/input_method/xkeyboard.h"
 #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout.h"
@@ skipping 326 matching lines @@
     g_browser_process->browser_policy_connector()->InitializeUserPolicy(
         username, false  /* wait_for_policy_fetch */);
     content::NotificationService::current()->Notify(
         chrome::NOTIFICATION_SESSION_STARTED,
         content::NotificationService::AllSources(),
         content::NotificationService::NoDetails());
   }
 
   // In Aura builds this will initialize ash::Shell.
   ChromeBrowserMainPartsLinux::PreProfileInit();
-
-  // Initialize desktop background observer so that it can receive
-  // LOGIN_USER_CHANGED notification from UserManager.
-  desktop_background_observer_.reset(new chromeos::DesktopBackgroundObserver);
 }
 
 void ChromeBrowserMainPartsChromeos::PostProfileInit() {
   // -- This used to be in ChromeBrowserMainParts::PreMainMessageLoopRun()
   // -- just after CreateProfile().
 
   if (parsed_command_line().HasSwitch(switches::kLoginUser) &&
       !parsed_command_line().HasSwitch(switches::kLoginPassword)) {
     // Pass the TokenService pointer to the policy connector so user policy can
     // grab a token and register with the policy server.
@@ skipping 109 matching lines @@
 
   // Let VideoPropertyWriter unregister itself as an observer of the ash::Shell
   // singleton before the shell is destroyed.
   video_property_writer_.reset();
   // Remove PowerButtonObserver attached to a D-Bus client before
   // DBusThreadManager is shut down.
   power_button_observer_.reset();
 
   ChromeBrowserMainPartsLinux::PostMainMessageLoopRun();
 }