Added screen options menu.

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 180 matching lines @@
   padding:30px 42px;
   width: 500px;
   height: auto;
   overflow: hidden;
   z-index: 100;
   opacity: 0.0;
   -webkit-transform: scale(1.05);
   -webkit-transition: all 0.218s;
 }
 
-button:active, .toggle-button-active {
+button:active:not([disabled]) {
   background: #ebebeb -webkit-linear-gradient(#f4f4f4, #efefef 40%, #dcdcdc);
   color: #333;
   -webkit-box-shadow: inset 0px 1px 3px rgba(0, 0, 0, 0.2);
 }
 
 button[disabled], button[disabled]:hover, button[disabled]:active {
   background: -webkit-linear-gradient(#fafafa, #f4f4f4 40%, #e5e5e5);
   border-color: #aaa;
   color: #888;
   -webkit-box-shadow: none;
@@ skipping 280 matching lines @@
 #session-mode {
   position: absolute;
   -webkit-box-shadow: 0 0 8px 0 black;
   -webkit-user-select: none;
 }
 
 #session-client-plugin {
   display: block;
 }
 
-#toggle-scaling {
-  margin: 1px 0 0 0;
-  padding: 1px;
-  min-width: 0;
-  line-height: 0;
-}
-
 #top-secondary {
   margin-top: 10px
 }
 
 * {
   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;
 }