Creating multi profile animations for switching users and teleporting of windows.

chrome/browser/chromeos/login/wallpaper_manager.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/wallpaper_manager.h"
 
 #include <numeric>
 #include <vector>
 
 #include "ash/shell.h"
@@ skipping 684 matching lines @@
   ScheduleSetUserWallpaper(email, true);
 }
 
 void WallpaperManager::SetUserWallpaperNow(const std::string& email) {
   ScheduleSetUserWallpaper(email, false);
 }
 
 void WallpaperManager::ScheduleSetUserWallpaper(const std::string& email,
                                                 bool delayed) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  // Some unit tests come here without a UserManager.
+  if (!UserManager::IsInitialized())
+    return;
   // There is no visible background in  kiosk mode.
   if (UserManager::Get()->IsLoggedInAsKioskApp())
     return;
   // Guest user, regular user in ephemeral mode, or kiosk app.
   const User* user = UserManager::Get()->FindUser(email);
   if (UserManager::Get()->IsUserNonCryptohomeDataEphemeral(email) ||
       (user != NULL && user->GetType() == User::USER_TYPE_KIOSK_APP)) {
     InitInitialUserWallpaper(email, false);
     GetPendingWallpaper(email, delayed)->ResetSetDefaultWallpaper();
     return;
@@ skipping 311 matching lines @@
     // crosbug.com/38429.
     LOG(ERROR) << "Wallpaper reverts to default unexpected.";
     DoSetDefaultWallpaper(on_finish.Pass());
   }
 }
 
 bool WallpaperManager::GetUserWallpaperInfo(const std::string& email,
                                             WallpaperInfo* info){
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
-  if (UserManager::Get()->IsUserNonCryptohomeDataEphemeral(email)) {
+  // Some unit tests come here with no browser local state attached.
+  if (UserManager::Get()->IsUserNonCryptohomeDataEphemeral(email) ||
+      !g_browser_process->local_state()) {
     // Default to the values cached in memory.
     *info = current_user_wallpaper_info_;
 
     // Ephemeral users do not save anything to local state. But we have got
     // wallpaper info from memory. Returns true.
     return true;
   }
 
   const base::DictionaryValue* user_wallpapers =
       g_browser_process->local_state()->
@@ skipping 139 matching lines @@
                            User::DEFAULT,
                            base::Time::Now().LocalMidnight()
                          };
     SetUserWallpaperInfo(email, info, true);
 
     if (update_wallpaper)
       DoSetDefaultWallpaper(on_finish.Pass());
     return;
   }
 
-  // Only cache user wallpaper at login screen.
-  if (!UserManager::Get()->IsUserLoggedIn()) {
-    wallpaper_cache_.insert(std::make_pair(email, wallpaper.image()));
+  // Only cache the user wallpaper at login screen and for multi profile users.
+  if (!UserManager::Get()->IsUserLoggedIn() ||
+      (UserManager::Get()->GetLoggedInUsers().size() > 1)) {

[Nikita (slow), 2014/01/30 14:03:40]

I've found that this doesn't quite work.

1. Add couple of users to multi-profile session
2. Now change wallpaper for user A. Wallpaper is changed.
3. Switch to user B desktop and back.
4. See that user A old wallpaper is shown.
5. Switch to user B and changes wallpaper, same issue after switching to user A
and back.

+    wallpaper_cache_[email] = wallpaper.image();
   }
+
   if (update_wallpaper) {
     ash::Shell::GetInstance()->desktop_background_controller()->
         SetCustomWallpaper(wallpaper.image(), layout);
   }
 }
 
 void WallpaperManager::ProcessCustomWallpaper(
     const std::string& user_id_hash,
     bool persistent,
     const WallpaperInfo& info,
@@ skipping 116 matching lines @@
     loading_.push_back(new WallpaperManager::PendingWallpaper(
         (delayed ? GetWallpaperLoadDelay()
                  : base::TimeDelta::FromMilliseconds(0)),
         username));
     pending_inactive_ = loading_.back();
   }
   return pending_inactive_;
 }
 
 }  // namespace chromeos