Add butter bar to login screen to show device enrollement info.

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

Index: chrome/browser/resources/chromeos/login/display_manager.js
diff --git a/chrome/browser/resources/chromeos/login/display_manager.js b/chrome/browser/resources/chromeos/login/display_manager.js
index df6561e2e43d24a5bdc051ba076e8b31e033bc10..ca32c256feb43b233d56bb3ec3001b7af26dc3ae 100644
--- a/chrome/browser/resources/chromeos/login/display_manager.js
+++ b/chrome/browser/resources/chromeos/login/display_manager.js
@@ -402,6 +402,17 @@ cr.define('cr.ui.login', function() {
     $(labelId).textContent = labelText;
   };
 
+  /**
+   * Sets the text content of the enterprise info message.
+   * If the text is empty, the entire notification will be hidden.
+   * @param {string} messageText The message text.
+   */
+  DisplayManager.setEnterpriseInfo = function(messageText) {
+    $('enterprise-info-message').textContent = messageText;
+    var container = $('enterprise-info-container');
+    container.style.visibility = messageText == '' ? 'hidden' : 'visible';
+  };
+
   // Export
   return {
     DisplayManager: DisplayManager