Add a new App launcher promo to the apps page / NTP.

chrome/browser/resources/ntp4/new_tab.js

 // Copyright (c) 2012 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 New tab page
  * This is the main code for the new tab page used by touch-enabled Chrome
  * browsers.  For now this is still a prototype.
  */
 
@@ skipping 109 matching lines @@
 
   /**
    * Invoked at startup once the DOM is available to initialize the app.
    */
   function onLoad() {
     // This will end up calling ntp.gotShouldShowApps.
     chrome.send('getShouldShowApps');
     sectionsToWaitFor = 0;
     if (loadTimeData.getBoolean('showMostvisited'))
       sectionsToWaitFor++;
-    if (loadTimeData.getBoolean('showApps'))
+    if (loadTimeData.getBoolean('showApps')) {
       sectionsToWaitFor++;
+      if (loadTimeData.getBoolean('showAppLauncherPromo')) {
+        $('app-launcher-promo-close-button').addEventListener('click',
+            function() { chrome.send('stopShowingAppLauncherPromo'); });
+      }
+    }
     if (loadTimeData.getBoolean('isDiscoveryInNTPEnabled'))
       sectionsToWaitFor++;
     measureNavDots();
 
     // Load the current theme colors.
     themeChanged();
 
     newTabView = new NewTabView();
 
     notificationContainer = getRequiredElement('notification-container');
@@ skipping 478 matching lines @@
   }
 
   function appRemoved() {
     return newTabView.appRemoved.apply(newTabView, arguments);
   }
 
   function appsPrefChangeCallback() {
     return newTabView.appsPrefChangedCallback.apply(newTabView, arguments);
   }
 
+  function appLauncherPromoPrefChangeCallback() {
+    return newTabView.appLauncherPromoPrefChangeCallback.apply(newTabView,
+                                                               arguments);
+  }
+
   function appsReordered() {
     return newTabView.appsReordered.apply(newTabView, arguments);
   }
 
   function enterRearrangeMode() {
     return newTabView.enterRearrangeMode.apply(newTabView, arguments);
   }
 
   function setForeignSessions(sessionList, isTabSyncEnabled) {
     if (otherSessionsButton)
@@ skipping 23 matching lines @@
   function setAppToBeHighlighted(appId) {
     newTabView.highlightAppId = appId;
   }
 
   // Return an object with all the exports
   return {
     appAdded: appAdded,
     appMoved: appMoved,
     appRemoved: appRemoved,
     appsPrefChangeCallback: appsPrefChangeCallback,
+    appLauncherPromoPrefChangeCallback: appLauncherPromoPrefChangeCallback,
     enterRearrangeMode: enterRearrangeMode,
     getAppsCallback: getAppsCallback,
     getAppsPageIndex: getAppsPageIndex,
     getCardSlider: getCardSlider,
     onLoad: onLoad,
     gotShouldShowApps: gotShouldShowApps,
     leaveRearrangeMode: leaveRearrangeMode,
     logTimeToClick: logTimeToClick,
     NtpFollowAction: NtpFollowAction,
     saveAppPageName: saveAppPageName,
     setAppToBeHighlighted: setAppToBeHighlighted,
     setBookmarkBarAttached: setBookmarkBarAttached,
     setForeignSessions: setForeignSessions,
     setMostVisitedPages: setMostVisitedPages,
     setSuggestionsPages: setSuggestionsPages,
     setRecentlyClosedTabs: setRecentlyClosedTabs,
     setFaviconDominantColor: setFaviconDominantColor,
     showNotification: showNotification,
     themeChanged: themeChanged,
     updateLogin: updateLogin
   };
 });
 
 document.addEventListener('DOMContentLoaded', ntp.onLoad);
 
 var toCssPx = cr.ui.toCssPx;