[Webapp Refactor] Reliably cancels a connection.

remoting/webapp/crd/js/desktop_remoting_activity.js

Index: remoting/webapp/crd/js/desktop_remoting_activity.js
diff --git a/remoting/webapp/crd/js/desktop_remoting_activity.js b/remoting/webapp/crd/js/desktop_remoting_activity.js
index 0a6da791b314c8e7aa27283dfd6183a6a99818e1..a422d55d615f652aef7592a7110a25477196245f 100644
--- a/remoting/webapp/crd/js/desktop_remoting_activity.js
+++ b/remoting/webapp/crd/js/desktop_remoting_activity.js
@@ -30,6 +30,9 @@ remoting.DesktopRemotingActivity = function(parentActivity) {
       remoting.app_capabilities());
   /** @private {remoting.ClientSession} */
   this.session_ = null;
+  /** @private {remoting.ConnectingDialog} */
+  this.connectingDialog_ =
+      new remoting.ConnectingDialog(parentActivity.stop.bind(parentActivity));
 };
 
 /**
@@ -48,7 +51,10 @@ remoting.DesktopRemotingActivity.prototype.start =
       that.session_ = session;
       session.logHostOfflineErrors(!opt_suppressOfflineError);
       session.connect(host, credentialsProvider);
-  });
+  }).catch(remoting.Error.handler(
+    function(/** !remoting.Error */ error) {
+      that.parentActivity_.onConnectionFailed(error);
+  }));
 };
 
 remoting.DesktopRemotingActivity.prototype.stop = function() {
@@ -63,6 +69,7 @@ remoting.DesktopRemotingActivity.prototype.stop = function() {
  */
 remoting.DesktopRemotingActivity.prototype.onConnected =
     function(connectionInfo) {
+  this.connectingDialog_.hide();
   remoting.setMode(remoting.AppMode.IN_SESSION);
   if (!base.isAppsV2()) {
     remoting.toolbar.center();
@@ -125,6 +132,7 @@ remoting.DesktopRemotingActivity.prototype.dispose = function() {
   this.connectedView_ = null;
   base.dispose(this.session_);
   this.session_ = null;
+  this.connectingDialog_.hide();
 };
 
 /** @return {remoting.DesktopConnectedView} */
@@ -139,4 +147,9 @@ remoting.DesktopRemotingActivity.prototype.getSession = function() {
   return this.session_;
 };
 
+/** @return {remoting.ConnectingDialog} */
+remoting.DesktopRemotingActivity.prototype.getConnectingDialog = function() {
+  return this.connectingDialog_;
+};
+
 })();