cros: Views-login should emit login-prompt-visible.

Some autotests require this, such as login_SameSessionTwice.

Bug: 784495
Change-Id: I140aa2824f8a536c85c8f1f7ce5bc8e06748cb55
Reviewed-on: https://chromium-review.googlesource.com/973888
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544867}

chrome/browser/chromeos/login/ui/login_display_views.cc

@@ -10,6 +10,8 @@
 #include "chrome/browser/chromeos/login/user_selection_screen_proxy.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/ui/ash/login_screen_client.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/session_manager_client.h"
 #include "components/user_manager/known_user.h"
 
 namespace chromeos {
@@ -42,8 +44,16 @@ void LoginDisplayViews::Init(const user_manager::UserList& filtered_users,
   // Load the login screen.
   auto* client = LoginScreenClient::Get();
   client->SetDelegate(host_);
-  client->login_screen()->ShowLoginScreen(
-      base::BindOnce([](bool did_show) { CHECK(did_show); }));
+  client->login_screen()->ShowLoginScreen(base::BindOnce([](bool did_show) {
+    CHECK(did_show);
+
+    // Some auto-tests depend on login-prompt-visible, like
+    // login_SameSessionTwice.
+    VLOG(1) << "Emitting login-prompt-visible";
+    chromeos::DBusThreadManager::Get()
+        ->GetSessionManagerClient()
+        ->EmitLoginPromptVisible();
+  }));
 
   user_selection_screen_->Init(filtered_users);
   client->login_screen()->LoadUsers(