Added browser and OS credits link to EULA page.

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

 /* Copyright 2013 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.
  */
 
 #eula {
   min-height: 395px;
   padding: 70px 17px 21px;
 }
 
@@ skipping 64 matching lines @@
 
 #eula #stats-help-link {
   color: rgb(49, 106, 197);
 }
 
 #eula .step-contents {
   -webkit-margin-after: 30px;
   -webkit-margin-start: 32px;
 }
 
+#eula .credits {
+  clear: both;
+  font-size: small;
+  width: 620px;
+}
+
 #cros-eula-loading {
   -webkit-align-items: center;
   -webkit-flex-direction: column;
   -webkit-justify-content: center;
   display: none;
   height: 100%;
   width: 100%;
 }
 
 .step.eula-loading #cros-eula-frame {
   display: none;
 }
 
 .step.eula-loading #cros-eula-loading {
   display: -webkit-flex;
 }