cros: Fix header bar not showing up on lock screen.

login.HeaderBar.animateIn/Out is preferred during refactoring. However,
they are not properly wired. This CL fixes the problem.

BUG=233722

Review URL: https://codereview.chromium.org/14220004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195395 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -226,6 +226,20 @@ cr.define('login', function() {
     },
   };
 
+  /**
+   * Convenience wrapper of animateOut.
+   */
+  HeaderBar.animateOut = function(callback) {
+    $('login-header-bar').animateOut(callback);
+  };
+
+  /**
+   * Convenience wrapper of animateIn.
+   */
+  HeaderBar.animateIn = function() {
+    $('login-header-bar').animateIn();
+  }
+
   return {
     HeaderBar: HeaderBar
   };