Automatic host installation for IT2Me on Windows.

remoting/webapp/host_it2me_dispatcher.js

Index: remoting/webapp/host_it2me_dispatcher.js
diff --git a/remoting/webapp/host_it2me_dispatcher.js b/remoting/webapp/host_it2me_dispatcher.js
index f2a7e90c146d9d46d5ac4a4020238ec2bbfc9e31..3c2fce7762380181038c9bc5921a916ed42dfc74 100644
--- a/remoting/webapp/host_it2me_dispatcher.js
+++ b/remoting/webapp/host_it2me_dispatcher.js
@@ -56,6 +56,8 @@ remoting.HostIt2MeDispatcher.prototype.initialize =
 
   function onNativeMessagingStarted() {
     console.log('Native Messaging supported.');
+
+    that.npapiHost_ = null;
     onDispatcherInitialized();
   }
 
@@ -90,6 +92,20 @@ remoting.HostIt2MeDispatcher.prototype.onNativeMessagingError_ =
 }
 
 /**
+ * @return {boolean}
+ */
+remoting.HostIt2MeDispatcher.prototype.usingNpapi = function() {
+  return this.npapiHost_ != null;
+}
+
+/**
+ * @return {remoting.HostPlugin}
+ */
+remoting.HostIt2MeDispatcher.prototype.getNpapiHost = function() {
+  return this.npapiHost_;
+}
+
+/**
  * @param {string} email The user's email address.
  * @param {string} authServiceWithToken Concatenation of the auth service
  *     (e.g. oauth2) and the access token.