Add a reload button to host list.

remoting/webapp/main.css

 /* 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.
  */
 
 html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p,
 blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em,
 font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, dl,
 dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody,
 tfoot, thead, tr, th, td, button {
@@ skipping 231 matching lines @@
 }
 
 h2 {
   font-size: 16px;
   line-height:24px;
   font-weight: normal;
   color: #222;
   margin-bottom: 10px;
 }
 
+.h2-secondary {
+  float: __MSG_@@bidi_end_edge__;
+}
+
+#host-list-loading-indicator:not(.loading) #host-list-loading,
+#host-list-loading-indicator.loading #host-list-reload {
+  display: none;
+}
+
+#host-list-reload > img {
+  opacity: 0.3;
+}
+
+#host-list-reload:hover > img {
+  opacity: 0.4;
+}
+
 section > h2 {
   color: #666;
 }
 
 header {
   display: -webkit-flex;
   width: 100%;
 }
 
 html {
@@ skipping 419 matching lines @@
   box-sizing: border-box;
 }
 
 /*
  * Setting hidden on elements that match some rule overriding 'display' doesn't
  * do what you would expect unless this is made explicit (and !important).
  */
 [hidden] {
   display: none !important;
 }