Managed user creation flow:

chrome/browser/chromeos/login/managed/locally_managed_user_creation_screen.cc

Index: chrome/browser/chromeos/login/managed/locally_managed_user_creation_screen.cc
diff --git a/chrome/browser/chromeos/login/managed/locally_managed_user_creation_screen.cc b/chrome/browser/chromeos/login/managed/locally_managed_user_creation_screen.cc
index 079cfd2042a3ea0f6eed87d58775afc448111337..3fc3cd2fc7790e2fa4204781e035c4373e6d5d27 100644
--- a/chrome/browser/chromeos/login/managed/locally_managed_user_creation_screen.cc
+++ b/chrome/browser/chromeos/login/managed/locally_managed_user_creation_screen.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/chromeos/login/managed/locally_managed_user_creation_screen.h"
 
+#include "chrome/browser/chromeos/login/error_screen.h"
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 #include "chrome/browser/chromeos/login/managed/locally_managed_user_controller.h"
 #include "chrome/browser/chromeos/login/screen_observer.h"
@@ -13,10 +14,43 @@
 
 namespace chromeos {
 
+namespace {
+
+void ConfigureErrorScreen(ErrorScreen* screen,
+    const Network* network,
+    const NetworkPortalDetector::CaptivePortalStatus status) {
+  switch (status) {
+    case NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_UNKNOWN:
+    case NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_ONLINE:
+      NOTREACHED();
+      break;
+    case NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_OFFLINE:
+      screen->SetErrorState(ErrorScreen::ERROR_STATE_OFFLINE,
+                            std::string());
+      break;
+    case NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_PORTAL:
+      screen->SetErrorState(ErrorScreen::ERROR_STATE_PORTAL,
+                            network->name());
+      screen->FixCaptivePortal();
+      break;
+    case NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_PROXY_AUTH_REQUIRED:
+      screen->SetErrorState(ErrorScreen::ERROR_STATE_PROXY,
+                            std::string());
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
+}
+
+} // namespace
+
 LocallyManagedUserCreationScreen::LocallyManagedUserCreationScreen(
     ScreenObserver* observer,
     LocallyManagedUserCreationScreenHandler* actor)
-    : WizardScreen(observer), actor_(actor) {
+    : WizardScreen(observer),
+      actor_(actor),
+      on_error_screen_(false) {
   DCHECK(actor_);
   if (actor_)
     actor_->SetDelegate(this);
@@ -37,6 +71,27 @@ void LocallyManagedUserCreationScreen::Show() {
     actor_->Show();
     actor_->ShowInitialScreen();
   }
+
+  NetworkPortalDetector* detector = NetworkPortalDetector::GetInstance();
+  if (detector && !on_error_screen_) {
+    detector->AddObserver(this);
+    detector->ForcePortalDetection();
+  }
+  on_error_screen_ = false;
+}
+
+void LocallyManagedUserCreationScreen::OnPortalDetectionCompleted(
+    const Network* network,
+    const NetworkPortalDetector::CaptivePortalState& state)  {
+  if (state.status == NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_ONLINE) {
+    get_screen_observer()->HideErrorScreen(this);
+  } else {
+    on_error_screen_ = true;
+    ErrorScreen* screen = get_screen_observer()->GetErrorScreen();
+    ConfigureErrorScreen(screen, network, state.status);
+    screen->SetUIState(ErrorScreen::UI_STATE_LOCALLY_MANAGED);
+    get_screen_observer()->ShowErrorScreen();
+  }
 }
 
 void LocallyManagedUserCreationScreen::
@@ -54,10 +109,12 @@ void LocallyManagedUserCreationScreen::ShowInitialScreen() {
     actor_->ShowInitialScreen();
 }
 
-
 void LocallyManagedUserCreationScreen::Hide() {
   if (actor_)
     actor_->Hide();
+  NetworkPortalDetector* detector = NetworkPortalDetector::GetInstance();
+  if (detector && !on_error_screen_)
+    detector->RemoveObserver(this);
 }
 
 std::string LocallyManagedUserCreationScreen::GetName() const {