[cros] Pre-select the first user pod on login screen.

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

Index: chrome/browser/resources/chromeos/login/screen_account_picker.js
diff --git a/chrome/browser/resources/chromeos/login/screen_account_picker.js b/chrome/browser/resources/chromeos/login/screen_account_picker.js
index 830b49c9432c9548a77f2c7387fce9a56b56584d..f6113dd73ae14b1ad609bd1aea808eac19bab9fa 100644
--- a/chrome/browser/resources/chromeos/login/screen_account_picker.js
+++ b/chrome/browser/resources/chromeos/login/screen_account_picker.js
@@ -9,12 +9,19 @@
 cr.define('login', function() {
   /**
    * Maximum number of offline login failures before online login.
-     @type {number}
-     @const
+   * @type {number}
+   * @const
    */
   var MAX_LOGIN_ATTEMPTS_IN_POD = 3;
 
   /**
+   * Whether to preselect the first pod automatically on login screen.
+   * @type {boolean}
+   * @const
+   */
+  var PRESELECT_FIRST_POD = true;
+
+  /**
    * Creates a new account picker screen div.
    * @constructor
    * @extends {HTMLDivElement}
@@ -69,7 +76,9 @@ cr.define('login', function() {
       var lockedPod = podRow.lockedPod;
       $('add-user-header-bar-item').hidden = !!lockedPod;
       $('sign-out-user-item').hidden = !lockedPod;
-      if (lockedPod) {
+      var preselectedPod = PRESELECT_FIRST_POD ?
+          lockedPod || podRow.pods[0] : lockedPod;
+      if (preselectedPod) {
         // TODO(altimofeev): empirically I investigated that focus isn't
         // set correctly if following CSS rules are present:
         //
@@ -82,10 +91,10 @@ cr.define('login', function() {
         //
         // Workaround is either delete these rules or delay the focus setting.
         var self = this;
-        lockedPod.addEventListener('webkitTransitionEnd', function f(e) {
-          if (e.target == lockedPod) {
-            podRow.focusPod(lockedPod);
-            lockedPod.removeEventListener(f);
+        preselectedPod.addEventListener('webkitTransitionEnd', function f(e) {
+          if (e.target == preselectedPod) {
+            podRow.focusPod(preselectedPod);
+            preselectedPod.removeEventListener(f);
             // Delay the accountPickerReady signal so that if there are any
             // timeouts waiting to fire we can process these first. This was
             // causing crbug.com/112218 as the account pod was sometimes focuse