Notify about major session changes events.

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 2341781f58215f13df01b9658a63e56a04f33597..ebe2781e74f7b2e256f4e9ba702abca35917aab7 100644
--- a/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
@@ -22,11 +22,15 @@
 #include "chromeos/dbus/session_manager_client.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 
-SessionStateDelegateChromeos::SessionStateDelegateChromeos() {
+SessionStateDelegateChromeos::SessionStateDelegateChromeos()
+    : state_(STATE_UNKNOWN) {
   chromeos::UserManager::Get()->AddSessionStateObserver(this);
+  chromeos::UserAddingScreen::Get()->AddObserver(this);
 }
 
 SessionStateDelegateChromeos::~SessionStateDelegateChromeos() {
+  chromeos::UserManager::Get()->RemoveSessionStateObserver(this);
+  chromeos::UserAddingScreen::Get()->RemoveObserver(this);
 }
 
 content::BrowserContext* SessionStateDelegateChromeos::GetBrowserContextByIndex(
@@ -210,6 +214,7 @@ void SessionStateDelegateChromeos::RemoveSessionStateObserver(
 
 void SessionStateDelegateChromeos::ActiveUserChanged(
     const chromeos::User* active_user) {
+  SetSessionState(STATE_SESSION);
   FOR_EACH_OBSERVER(ash::SessionStateObserver,
                     session_state_observer_list_,
                     ActiveUserChanged(active_user->email()));
@@ -217,7 +222,30 @@ void SessionStateDelegateChromeos::ActiveUserChanged(
 
 void SessionStateDelegateChromeos::UserAddedToSession(
     const chromeos::User* added_user) {
+  SetSessionState(STATE_SESSION);
   FOR_EACH_OBSERVER(ash::SessionStateObserver,
                     session_state_observer_list_,
                     UserAddedToSession(added_user->email()));
 }
+
+void SessionStateDelegateChromeos::OnUserAddingStarted() {
+  SetSessionState(STATE_LOGIN_SECONDARY);
+}
+
+void SessionStateDelegateChromeos::OnUserAddingFinished() {

[Mr4D (OOO till 08-26), 2014/04/10 01:33:08]

Do we also get here if the user cancels out of the "add user to session" screen?

[Nikita (slow), 2014/04/10 09:52:21]

Yes.

+  SetSessionState(STATE_SESSION);
+}
+
+void SessionStateDelegateChromeos::SetSessionState(SessionState new_state) {
+  if (state_ == new_state)
+    return;
+
+  state_ = new_state;
+  NotifySessionStateChanged();
+}
+
+void SessionStateDelegateChromeos::NotifySessionStateChanged() {
+  FOR_EACH_OBSERVER(ash::SessionStateObserver,
+                    session_state_observer_list_,
+                    SessionStateChanged(state_));
+}