Release all keys on blur.

remoting/webapp/me2mom/remoting_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.
 
 var remoting = chrome.extension.getBackgroundPage().remoting;
 
 // Chromoting session API version (for this javascript).
 // This is compared with the plugin API version to verify that they are
 // compatible.
 remoting.apiVersion = 2;
 
 // The oldest API version that we support.
 // This will differ from the |apiVersion| if we maintain backward
 // compatibility with older API versions.
 remoting.apiMinVersion = 1;
 
 // Message id so that we can identify (and ignore) message fade operations for
 // old messages.  This starts at 1 and is incremented for each new message.
 remoting.messageId = 1;
 
 remoting.scaleToFit = false;
 
 remoting.httpXmppProxy =
     'https://chromoting-httpxmpp-oauth2-dev.corp.google.com';
 
 window.addEventListener("load", init_, false);
+window.addEventListener('blur', pluginLostFocus_, false);
 
 // This executes a poll loop on the server for more Iq packets, and feeds them
 // to the plugin.
 function feedIq() {
   var xhr = new XMLHttpRequest();
   xhr.open('GET', remoting.httpXmppProxy + '/readIq?host_jid=' +
            encodeURIComponent(remoting.hostJid), true);
   xhr.withCredentials = true;
   xhr.onreadystatechange = function() {
     if (xhr.readyState == 4) {
@@ skipping 71 matching lines @@
 }
 
 function checkVersion(plugin) {
   return remoting.apiVersion >= plugin.apiMinVersion &&
       plugin.apiVersion >= remoting.apiMinVersion;
 }
 
 function init_() {
   // Kick off the connection.
   var plugin = document.getElementById('remoting');
-
   remoting.plugin = plugin;
 
   // Only allow https connections to the httpXmppProxy.
   var regExp = /^ *https:\/\//;
   if (remoting.httpXmppProxy.search(regExp) == -1) {
     addToDebugLog('Aborting. httpXmppProxy does not specify https protocol: ' +
                   remoting.httpXmppProxy);
     return;
   }
 
@@ skipping 14 matching lines @@
   if (!checkVersion(plugin)) {
     // TODO(garykac): We need better messaging here. Perhaps an install link.
     setClientStateMessage("Out of date. Please re-install.");
     return;
   }
 
   addToDebugLog('Connect as user ' + remoting.username);
   registerConnection();
 }
 
+function pluginLostFocus_() {
+  // If the plug loses input focus, release all keys as a precaution against
+  // leaving them 'stuck down' on the host.
+  if (remoting.plugin) {
+    remoting.plugin.releaseAllKeys();
+  }
+}
+
 function toggleScaleToFit() {
   remoting.scaleToFit = !remoting.scaleToFit;
   document.getElementById('scale-to-fit-toggle').value =
       remoting.scaleToFit ? 'No scaling' : 'Scale to fit';
   remoting.plugin.setScaleToFit(remoting.scaleToFit);
 }
 
 /**
  * This is the callback method that the plugin calls to request username and
  * password for logging into the remote host. For Me2Mom we are pre-authorized
@@ skipping 145 matching lines @@
       'Bandwidth: ' + videoBandwidth.toFixed(2) + units +
       ', Capture: ' + videoCaptureLatency.toFixed(2) + 'ms' +
       ', Encode: ' + videoEncodeLatency.toFixed(2) + 'ms' +
       ', Decode: ' + videoDecodeLatency.toFixed(2) + 'ms' +
       ', Render: ' + videoRenderLatency.toFixed(2) + 'ms' +
       ', Latency: ' + roundTripLatency.toFixed(2) + 'ms');
 
   // Update the stats once per second.
   window.setTimeout('updateStatusBarStats()', 1000);
 }