Release all keys on blur.

remoting/webapp/me2mom/remoting_session.js

Index: remoting/webapp/me2mom/remoting_session.js
diff --git a/remoting/webapp/me2mom/remoting_session.js b/remoting/webapp/me2mom/remoting_session.js
index 556d869f358fea3cf92d0bff2adc081d07eba647..cc438089ebcf477ce77f78701e6dc107ab629898 100644
--- a/remoting/webapp/me2mom/remoting_session.js
+++ b/remoting/webapp/me2mom/remoting_session.js
@@ -24,6 +24,7 @@ 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.
@@ -115,7 +116,6 @@ function checkVersion(plugin) {
 function init_() {
   // Kick off the connection.
   var plugin = document.getElementById('remoting');
-
   remoting.plugin = plugin;
 
   // Only allow https connections to the httpXmppProxy.
@@ -150,6 +150,14 @@ function init_() {
   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 =