arc: Provide progress to load TOS content for OptIn.

chrome/browser/resources/chromeos/arc_support/main.css

 /**
  * Copyright 2016 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.
  */
 
 html,
 body,
 webview,
 .section {
   font-family: 'Roboto';
   height: 100%;
   margin: 0;
   padding: 0;
   width: 100%;
 }
 
 #arc-support {
-  padding: 0;
+  width: 960px;

[khmel, 2016/07/08 21:59:34]

Please see comments in .js

[xiyuan, 2016/07/08 22:33:29]

Acknowledged.

+}
+
+#terms-view {
+  width: 468px;

[khmel, 2016/07/08 21:59:34]

the same as above.

[xiyuan, 2016/07/08 22:33:29]

Acknowledged.

 }
 
 .button-separator {
   width: 1px;
 }
 
 .checkbox-option {
   height: 16px;
   margin: 0;
   padding: 0 8px 0 0;
@@ skipping 18 matching lines @@
 }
 
 .section-flex {
   display: flex;
   flex-direction: column;
   height: 688px;
 }
 
 .section-checkbox-container {
   margin: auto;
-  padding: 16px 0 0 0;
+  padding: 8px 0 0 0;

[khmel, 2016/07/08 21:59:33]

Second checkbox section was added recently. However it broke layout
specification
(https://drive.google.com/a/google.com/folderview?id=0B6x6iYCtKinENXB6OTRtYlRP...).
This also includes changes in .section-terms below

[xiyuan, 2016/07/08 22:33:29]

Acknowledged.

   text-align: left;
   width: 468px;
 }
 
 .section-terms {
   border: 1px solid #e6e6e6;
   color: rgba(0, 0, 0, 0.54);
   flex: auto;
-  margin: auto;
+  margin: 0 auto 8px auto;
   overflow: hidden;
   padding: 0;
   width: 468px;
 }
 
 .text-desc {
   color: rgba(0, 0, 0, 0.54);
   font-size: 18px;
   font-weight: 300;
   line-height: 24px;
@@ skipping 41 matching lines @@
 
 a:link {
   color: rgb(51, 103, 214);
   text-decoration: none;
 }
 
 a:visited {
   color: rgb(51, 103, 214);
   text-decoration: none;
 }