Chrome OS multi-profiles backend and UI.

chrome/browser/chromeos/system/ash_system_tray_delegate.cc

Index: chrome/browser/chromeos/system/ash_system_tray_delegate.cc
diff --git a/chrome/browser/chromeos/system/ash_system_tray_delegate.cc b/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
index 9d9791c7a79f4161bf2c744a76d08afba5041e4b..2b79a641fa20dc592492a9790729ee011f0ed362 100644
--- a/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
+++ b/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "ash/ash_switches.h"
+#include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
@@ -56,6 +57,7 @@
 #include "chrome/browser/chromeos/login/base_login_display_host.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/login_display_host.h"
+#include "chrome/browser/chromeos/login/login_wizard.h"
 #include "chrome/browser/chromeos/login/user.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
@@ -368,15 +370,15 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
   }
 
   virtual const string16 GetUserDisplayName() const OVERRIDE {
-    return UserManager::Get()->GetLoggedInUser()->GetDisplayName();
+    return UserManager::Get()->GetActiveUser()->GetDisplayName();
   }
 
   virtual const std::string GetUserEmail() const OVERRIDE {
-    return UserManager::Get()->GetLoggedInUser()->display_email();
+    return UserManager::Get()->GetActiveUser()->display_email();
   }
 
   virtual const gfx::ImageSkia& GetUserImage() const OVERRIDE {
-    return UserManager::Get()->GetLoggedInUser()->image();
+    return UserManager::Get()->GetActiveUser()->image();
   }
 
   virtual ash::user::LoginStatus GetUserLoginStatus() const OVERRIDE {
@@ -402,6 +404,19 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
     return WizardController::IsOobeCompleted();
   }
 
+  virtual void GetLoggedInUsers(ash::UserEmailList* users) OVERRIDE {
+    const UserList& logged_in_users = UserManager::Get()->GetLoggedInUsers();
+    for (UserList::const_iterator it = logged_in_users.begin();
+         it != logged_in_users.end(); ++it) {
+      const User* user = (*it);
+      users->push_back(user->email());
+    }
+  }
+
+  virtual void SwitchActiveUser(const std::string& email) OVERRIDE {
+    UserManager::Get()->SwitchActiveUser(email);
+  }
+
   virtual void ChangeProfilePicture() OVERRIDE {
     content::RecordAction(
         content::UserMetricsAction("OpenChangeProfilePictureDialog"));
@@ -506,6 +521,47 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
     }
   }
 
+  virtual void ShowUserLogin() OVERRIDE {
+    if (!ash::Shell::GetInstance()->delegate()->IsMultiProfilesEnabled())
+      return;
+
+    // Only regular users could add other users to current session.
+    if (UserManager::Get()->GetActiveUser()->GetType() !=
+            User::USER_TYPE_REGULAR) {
+      return;
+    }
+
+    // TODO(nkostylev): Show optional intro dialog about this feature.
+
+    // TODO(nkostylev): Show some UI messages why no more users could be added
+    // to this session.
+    // We limit list of logged in users to 3 due to memory constraints.
+    // TODO(nkostylev): Adjust this limitation based on device capabilites.
+    if (UserManager::Get()->GetLoggedInUsers().size() >= 3)
+      return;
+
+    // Check whether there're regular users on the list that are not
+    // currently logged in.
+    const UserList& users = UserManager::Get()->GetUsers();
+    bool has_regular_not_logged_in_users = false;
+    for (UserList::const_iterator it = users.begin(); it != users.end(); ++it) {
+      const User* user = (*it);
+      if (user->GetType() == User::USER_TYPE_REGULAR &&
+          !user->is_logged_in()) {
+        has_regular_not_logged_in_users = true;
+        break;
+      }
+    }
+
+    // Launch sign in screen to add another user to current session.
+    if (has_regular_not_logged_in_users) {
+      ash::Shell::GetInstance()->
+          desktop_background_controller()->MoveDesktopToLockedContainer();

[Dmitry Polukhin, 2013/04/11 13:34:15]

Will it handle multiple monitors? I.e. it looks like a lock screen so it should
be lock screen.

[Nikita (slow), 2013/04/12 15:41:25]

Yes, this method is multi-monitor aware and is already used on lock/unlock.

+      gfx::Size size(0, 0);
+      ShowLoginWizard(std::string(), size);
+    }
+  }
+
   virtual void ShutDown() OVERRIDE {
     ash::Shell::GetInstance()->session_state_controller()->RequestShutdown();
   }