cros: Add SAML redirect banner for enrollment.

chrome/browser/resources/chromeos/login/oobe_screen_oauth_enrollment.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.
  */
 
 #oauth-enrollment {
   min-height: 609px;
   padding: 70px 17px 21px;
   width: 722px;
 }
@@ skipping 72 matching lines @@
   text-decoration: underline;
 }
 
 #oobe.oauth-enrollment #header-oauth-enrollment {
   display: block;
 }
 
 #oauth-enrollment .step-contents {
   -webkit-margin-after: 10px;
 }
+
+#oauth-saml-notice-container {
+  left: 0;
+  position: absolute;
+  right: 0;
+  text-align: center;
+  top: 62px;
+}
+
+#oauth-enrollment.saml {
+  padding: 97px 0 21px;
+}
+
+#oauth-enrollment.saml #oauth-enroll-signin-frame {
+  height: 444px;
+}
+
+#oauth-enrollment.saml #oauth-enrollment-controls,
+#oauth-enrollment.saml #oauth-enroll-signin-link-container {
+  -webkit-padding-end: 17px;
+}
+
+#oauth-enrollment:not(.saml) #oauth-saml-notice-container {
+  display: none;
+}
+
+#oauth-saml-notice-message {
+  margin: 0 auto;
+}