ntp4: record app launch source

chrome/browser/resources/ntp4/recently_closed.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview The recently closed menu: button, model data, and menu.
  */
 
 cr.define('ntp4', function() {
   'use strict';
@@ skipping 72 matching lines @@
         a.classList.add('recent-window');
         a.textContent = formatTabsText(data.tabs.length);
       } else {
         a.href = data.url;
         a.style.backgroundImage = 'url(chrome://favicon/' + data.url + ')';
         a.textContent = data.title;
         // TODO(estade): add app ping url.
       }
 
       function onActivate(e) {
+        chrome.send('recordAppLaunchByURL',
+                    [encodeURIComponent(data.url),
+                     ntp4.APP_LAUNCH.NTP_RECENTLY_CLOSED]);
         // TODO(estade): don't convert to string.
         chrome.send('reopenTab', [String(data.sessionId)]);
+        // We are likely deleted by this point!
+
         e.preventDefault();
       }
       a.addEventListener('activate', onActivate);
 
       this.menu.appendChild(a);
       cr.ui.decorate(a, MenuItem);
     },
   };
 
   return {
     RecentMenuButton: RecentMenuButton,
   };
 });