Use a split toggle button to reflect scaling state.

remoting/webapp/me2mom/client_session.js

 // Copyright (c) 2011 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.
 
 /**
  * @fileoverview
  * Session class that handles creation and teardown of a remoting session.
  *
  * This abstracts a <embed> element and controls the plugin which does the
  * actual remoting work.  There should be no UI code inside this class.  It
@@ skipping 347 matching lines @@
   this.plugin.width = width;
   this.plugin.height = height;
 };
 
 /**
  * Informs the plugin that it should scale itself.
  *
  * @param {boolean} shouldScale If the plugin should scale itself.
  * @return {void} Nothing.
  */
-remoting.ClientSession.prototype.toggleScaleToFit = function(shouldScale) {
+remoting.ClientSession.prototype.setScaleToFit = function(shouldScale) {
   if (shouldScale) {
     if (this.plugin.desktopWidth == 0 ||
         this.plugin.desktopHeight == 0) {
       remoting.debug.log('desktop size is not known yet.');
       return;
     }
 
     // Make sure both width and height are multiples of two.
     var width = window.innerWidth;
     var height = window.innerHeight;
@@ skipping 39 matching lines @@
     'video_bandwidth': this.plugin.videoBandwidth,
     'capture_latency': this.plugin.videoCaptureLatency,
     'encode_latency': this.plugin.videoEncodeLatency,
     'decode_latency': this.plugin.videoDecodeLatency,
     'render_latency': this.plugin.videoRenderLatency,
     'roundtrip_latency': this.plugin.roundTripLatency
   };
 };
 
 }());