ntp4: record app launch source

chrome/browser/resources/ntp4/most_visited_page.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.
 
 cr.define('ntp4', function() {
   'use strict';
 
   var TilePage = ntp4.TilePage;
 
   /**
@@ skipping 100 matching lines @@
 
     /**
      * Handles a click on the tile.
      * @param {Event} e The click event.
      */
     handleClick_: function(e) {
       if (e.target.classList.contains('close-button')) {
         this.blacklist_();
         e.preventDefault();
       } else {
+        // Records an app launch from the most visited page (Chrome will decide
+        // whether the url is an app).
+        chrome.send('recordAppLaunchByURL',
+                    [encodeURIComponent(this.href),
+                     ntp4.APP_LAUNCH.NTP_MOST_VISITED]);
+        // Records the index of this tile.
         chrome.send('recordInHistogram', ['NTP_MostVisited', this.index, 8]);
       }
     },
 
     /**
      * Allow blacklisting most visited site using the keyboard.
      */
     handleKeyDown_: function(e) {
       if (!IS_MAC && e.keyCode == 46 || // Del
           IS_MAC && e.metaKey && e.keyCode == 8) { // Cmd + Backspace
@@ skipping 232 matching lines @@
     if (tile)
       tile.setStripeColor(color);
   };
 
   return {
     MostVisitedPage: MostVisitedPage,
     refreshData: refreshData,
     setFaviconDominantColor: setFaviconDominantColor,
   };
 });