[Chromoting] Add ability to enable/disable GDrive support per-app in gyp.

remoting/webapp/app_remoting/js/ar_main.js

Index: remoting/webapp/app_remoting/js/ar_main.js
diff --git a/remoting/webapp/app_remoting/js/ar_main.js b/remoting/webapp/app_remoting/js/ar_main.js
index b15cdffba1ee352501a18da767a368ce237548cd..d825463df9272809a2df3a1ac5f96a67d95b60e4 100644
--- a/remoting/webapp/app_remoting/js/ar_main.js
+++ b/remoting/webapp/app_remoting/js/ar_main.js
@@ -11,7 +11,7 @@ var remoting = remoting || {};
  * Entry point ('load' handler) for App Remoting webapp.
  */
 remoting.startAppRemoting = function() {
-  remoting.app = new remoting.Application();
+  remoting.app = new remoting.Application(remoting.app_features);
   var app_remoting = new remoting.AppRemoting(remoting.app);
   remoting.app.start();
 };