On active, dismiss the retail mode screensaver immidiately.

chrome/browser/resources/chromeos/login/demo_user_login.js

Index: chrome/browser/resources/chromeos/login/demo_user_login.js
diff --git a/chrome/browser/resources/chromeos/login/demo_user_login.js b/chrome/browser/resources/chromeos/login/demo_user_login.js
index 7828af634e68c643fcfef6ada33d294327e9a130..269bd7e86e487be1646e2fbfcf91eed0a3462c4b 100644
--- a/chrome/browser/resources/chromeos/login/demo_user_login.js
+++ b/chrome/browser/resources/chromeos/login/demo_user_login.js
@@ -14,6 +14,7 @@
 onClick = function(e) {
   document.removeEventListener('click', onClick);
   e.stopPropagation();
+  showLoginSpinner();
   chrome.send('launchDemoUser');
 };
 
@@ -30,5 +31,21 @@ initialize = function() {
   });
 };
 
+/**
+ * Show the login spinner.
+ */
+showLoginSpinner = function() {
+  // We're already logging in - don't login on click.
+  document.removeEventListener('click', onClick);
+
+  // Hide the "Click to start" assets.
+  $('logo').hidden = true;
+  $('demo-login-text').hidden = true;
+
+  // Show the "Logging in" assets.
+  $('logo-login').hidden = false;
+  $('login-spinner').hidden = false;
+};
+
 disableTextSelectAndDrag();
 document.addEventListener('DOMContentLoaded', initialize);