Added browser and OS credits link to EULA page.

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview Oobe eula screen implementation.
  */
 
 login.createScreen('EulaScreen', 'eula', function() {
   return {
     /** @override */
     decorate: function() {
+      if (Oobe.getInstance().forceKeyboardFlow) {
+        $('eula-chrome-credits-link').addEventListener('click',
+          function(event) {
+            chrome.send('eulaOnChromeCredits');
+        });

[xiyuan, 2014/05/13 00:28:41]

nit: } should align with functioni, i.e. indent 2 more spaces

+        $('eula-chromeos-credits-link').addEventListener('click',
+          function(event) {
+            chrome.send('eulaOnChromeOSCredits');
+        });

[xiyuan, 2014/05/13 00:28:41]

ditto

+      } else {
+        $('eula-chrome-credits-link').hidden = true;
+        $('eula-chromeos-credits-link').hidden = true;
+      }
       $('stats-help-link').addEventListener('click', function(event) {
         chrome.send('eulaOnLearnMore');
       });
       $('installation-settings-link').addEventListener(
           'click', function(event) {
             chrome.send('eulaOnInstallationSettingsPopupOpened');
             $('popup-overlay').hidden = false;
             $('installation-settings-ok-button').focus();
           });
       $('installation-settings-ok-button').addEventListener(
@@ skipping 92 matching lines @@
       if ($('cros-eula-frame').src) {
         $('cros-eula-frame').src = $('cros-eula-frame').src;
       }
       if ($('oem-eula-frame').src) {
         $('oem-eula-frame').src = $('oem-eula-frame').src;
       }
     }
   };
 });