Add UI components for license type selection in ChromeOS login UI.

chrome/browser/resources/chromeos/login/oobe_screen_oauth_enrollment.html

 <!-- Copyright 2015 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. -->
 
 <link rel="import" href="chrome://oobe/custom_elements.html">
 
 <div id="oauth-enrollment" class="step no-logo hidden" hidden>
   <div id="oauth-enroll-step-contents">
     <div id="oauth-enroll-step-signin">
       <webview id="oauth-enroll-auth-view" name="oauth-enroll-auth-view">
       </webview>
     </div>
     <div id="oauth-enroll-step-working">
       <throbber-notice class="fit" i18n-values="text:oauthEnrollWorking">
       </throbber-notice>
     </div>
+    <div id="oauth-enroll-step-license">
+      <enrollment-license-card id="oauth-enroll-license-ui"
+                               i18n-values="button-text:oauthEnrollNextBtn">
+      </enrollment-license-card>
+    </div>
     <div id="oauth-enroll-step-ad-join">
       <offline-ad-login id="oauth-enroll-ad-join-ui" show-machine-input
           class="fit" i18n-values=
           "ad-welcome-message:oauthEnrollAdDomainJoinWelcomeMessage">
       </offline-ad-login>
     </div>
     <div id="oauth-enroll-step-error" role="alert">
       <notification-card id="oauth-enroll-error-card" type="fail"
           i18n-values="button-label:oauthEnrollRetry">
       </notification-card>
@@ skipping 49 matching lines @@
       <notification-card id="oauth-enroll-active-directory-join-error-card"
           type="fail" i18n-values="button-label:oauthEnrollRetry">
       </notification-card>
     </div>
   </div>
   <div id="oauth-saml-notice-container">
     <span id="oauth-saml-notice-message"></span>
   </div>
   <navigation-bar id="oauth-enroll-navigation"></navigation-bar>
 </div>