Add responsive and unresponsive events for window.

browser/default_app/index.html

@@ -7,9 +7,11 @@
   This is the default mode of Atom Shell, please follow the instructions in
   wiki to get started.
   <script type="text/javascript" charset="utf-8">
+
     var ipc = require('ipc');
 
     window.addEventListener('contextmenu', function (e) {
+      while(1) {}
       e.preventDefault();
       ipc.send('menu');
     }, false);

browser/default_app/main.js

@@ -30,6 +30,10 @@ delegate.browserMainParts.preMainMessageLoopRun = function() {
     mainWindow = null;
   });
 
+  mainWindow.on('unresponsive', function() {
+    console.log('unresponsive');
+  });
+
   var template = [
     {
       label: 'Atom Shell',