Add SessionStateObserver with ActiveUserChanged()

chrome/browser/ui/ash/session_state_delegate_chromeos.cc

Index: chrome/browser/ui/ash/session_state_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/session_state_delegate_chromeos.cc b/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
index c9bb73e8c67ec9560ebd93a0779b9b8e9c3740f5..95068d625de3b72572ae9da63a681ae62f0c3167 100644
--- a/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
@@ -4,13 +4,16 @@
 
 #include "chrome/browser/ui/ash/session_state_delegate.h"
 
+#include "ash/session_state_observer.h"
 #include "base/logging.h"
 #include "chrome/browser/chromeos/login/screen_locker.h"
+#include "chrome/browser/chromeos/login/user.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/session_manager_client.h"
 
 SessionStateDelegate::SessionStateDelegate() {
+  chromeos::UserManager::Get()->AddSessionStateObserver(this);
 }
 
 SessionStateDelegate::~SessionStateDelegate() {
@@ -72,8 +75,7 @@ const gfx::ImageSkia& SessionStateDelegate::GetUserImage(
   return chromeos::UserManager::Get()->GetLRULoggedInUsers()[index]->image();
 }
 
-void SessionStateDelegate::GetLoggedInUsers(
-    ash::UserEmailList* users) {
+void SessionStateDelegate::GetLoggedInUsers(ash::UserIdList* users) {
   const chromeos::UserList& logged_in_users =
       chromeos::UserManager::Get()->GetLoggedInUsers();
   for (chromeos::UserList::const_iterator it = logged_in_users.begin();
@@ -83,6 +85,23 @@ void SessionStateDelegate::GetLoggedInUsers(
   }
 }
 
-void SessionStateDelegate::SwitchActiveUser(const std::string& email) {
-  chromeos::UserManager::Get()->SwitchActiveUser(email);
+void SessionStateDelegate::SwitchActiveUser(const std::string& user_id) {
+  chromeos::UserManager::Get()->SwitchActiveUser(user_id);
+}
+
+void SessionStateDelegate::AddSessionStateObserver(
+    ash::SessionStateObserver* observer) {
+  session_state_observer_list_.AddObserver(observer);
+}
+
+void SessionStateDelegate::RemoveSessionStateObserver(
+    ash::SessionStateObserver* observer) {
+  session_state_observer_list_.RemoveObserver(observer);
+}
+
+void SessionStateDelegate::ActiveUserChanged(
+    const chromeos::User* active_user) {
+  FOR_EACH_OBSERVER(ash::SessionStateObserver,
+                    session_state_observer_list_,
+                    ActiveUserChanged(active_user->email()));
 }