Add PyAuto test for DeviceGuestModeEnabled policy

chrome/browser/automation/automation_provider_observers_chromeos.cc

Index: chrome/browser/automation/automation_provider_observers_chromeos.cc
diff --git a/chrome/browser/automation/automation_provider_observers_chromeos.cc b/chrome/browser/automation/automation_provider_observers_chromeos.cc
index ead07cbf90d4fa253ec0a41e64c956a118bbbae0..4167ac0579d4d723d49a42accc24834598bb9e39 100644
--- a/chrome/browser/automation/automation_provider_observers_chromeos.cc
+++ b/chrome/browser/automation/automation_provider_observers_chromeos.cc
@@ -48,21 +48,26 @@ void NetworkManagerInitObserver::OnNetworkManagerChanged(NetworkLibrary* obj) {
   }
 }
 
-LoginWebuiReadyObserver::LoginWebuiReadyObserver(
-    AutomationProvider* automation)
+LoginWebuiReadyObserver::LoginWebuiReadyObserver(AutomationProvider* automation)
     : automation_(automation->AsWeakPtr()) {
   registrar_.Add(this, chrome::NOTIFICATION_LOGIN_WEBUI_READY,
                  content::NotificationService::AllSources());
-}
-
-LoginWebuiReadyObserver::~LoginWebuiReadyObserver() {
+  registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_IMAGES_LOADED,
+                 content::NotificationService::AllSources());
+  registrar_.Add(this, chrome::NOTIFICATION_LOGIN_NETWORK_ERROR_SHOWN,

[Nirnimesh, 2012/05/16 19:48:26]

When is this raised?
It takes a while for the login dialog to show up, and the network error screen 
before that for a few seconds. Is that it?

[Nikita (slow), 2012/05/22 11:09:16]

Yes, it is that one. So in that case you'll see
NOTIFICATION_LOGIN_NETWORK_ERROR_SHOWN then
NOTIFICATION_LOGIN_WEBUI_READY

Now I've realized that for the purposes of autotest we probably don't want to
treat that as "LoginWebuiReady" as it is not ready but in fact in some error or
temporary (while network is connecting) state.

Sorry for confusion.

+                 content::NotificationService::AllSources());
+  registrar_.Add(this, chrome::NOTIFICATION_WIZARD_FIRST_SCREEN_SHOWN,
+                 content::NotificationService::AllSources());
 }
 
 void LoginWebuiReadyObserver::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
-  DCHECK(type == chrome::NOTIFICATION_LOGIN_WEBUI_READY);
+  DCHECK(type == chrome::NOTIFICATION_LOGIN_WEBUI_READY ||
+         type == chrome::NOTIFICATION_LOGIN_USER_IMAGES_LOADED ||
+         type == chrome::NOTIFICATION_LOGIN_NETWORK_ERROR_SHOWN ||
+         type == chrome::NOTIFICATION_WIZARD_FIRST_SCREEN_SHOWN);
   if (automation_)
     automation_->OnLoginWebuiReady();
   delete this;