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

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

Index: chrome/browser/resources/chromeos/login/login.js
diff --git a/chrome/browser/resources/chromeos/login/login.js b/chrome/browser/resources/chromeos/login/login.js
index 55463cba65523527f993a8a9580812ad1bec9dbb..a8eedc230bf862ea1289b99b0a1aa75b60af7992 100644
--- a/chrome/browser/resources/chromeos/login/login.js
+++ b/chrome/browser/resources/chromeos/login/login.js
@@ -159,6 +159,15 @@ cr.define('cr.ui', function() {
     DisplayManager.setLabelText(labelId, 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.
+   */
+  Oobe.setEnterpriseInfo = function(messageText) {
+    DisplayManager.setEnterpriseInfo(messageText);
+  };
+
   // Export
   return {
     Oobe: Oobe