Add a flag that lets the webstore show a different UI on app install.

chrome/browser/ui/views/extensions/extension_installed_bubble.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_INSTALLED_BUBBLE_H_
 #define CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_INSTALLED_BUBBLE_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/ui/views/bubble/bubble.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 class Browser;
 class Extension;
 class InstalledBubbleContent;
 class SkBitmap;
 
 // Provides feedback to the user upon successful installation of an
 // extension. Depending on the type of extension, the Bubble will
 // point to:
 //    OMNIBOX_KEYWORD-> The omnibox.
 //    BROWSER_ACTION -> The browserAction icon in the toolbar.
 //    PAGE_ACTION    -> A preview of the pageAction icon in the location
 //                      bar which is shown while the Bubble is shown.
+//    APP            -> The plus button in the tabstrip (for the New Tab Page).
 //    GENERIC        -> The wrench menu. This case includes pageActions that
 //                      don't specify a default icon.
 //
 // ExtensionInstallBubble manages its own lifetime.
 class ExtensionInstalledBubble
     : public BubbleDelegate,
       public NotificationObserver,
       public base::RefCountedThreadSafe<ExtensionInstalledBubble> {
  public:
   // The behavior and content of this Bubble comes in these varieties:
   enum BubbleType {
     OMNIBOX_KEYWORD,
     BROWSER_ACTION,
     PAGE_ACTION,
+    APP,
     GENERIC
   };
 
   // Creates the ExtensionInstalledBubble and schedules it to be shown once
   // the extension has loaded. |extension| is the installed extension. |browser|
   // is the browser window which will host the bubble. |icon| is the install
   // icon of the extension.
   static void Show(
       const Extension* extension, Browser *browser, const SkBitmap& icon);
 
@@ skipping 26 matching lines @@
   InstalledBubbleContent* bubble_content_;
   BubbleType type_;
 
   // How many times we've deferred due to animations being in progress.
   int animation_wait_retries_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionInstalledBubble);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_INSTALLED_BUBBLE_H_