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

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 3861 matching lines @@
       </message>
       <message name="IDS_EXTENSION_PACKAGE_INSTALL_ERROR" desc="Error message in case package fails to install because of some problem with the filesystem.">
         Could not install package: '<ph name="ERROR_CODE">$1<ex>error</ex></ph>'
       </message>
 
       <!-- Extension installed bubble -->
       <message name="IDS_EXTENSION_INSTALLED_HEADING" desc="First line in the content area of the extension installed bubble. Instructs that the extension was installed.">
         <ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph> is now installed.
       </message>
 
+      <message name="IDS_EXTENSION_INSTALLED_APP_INFO" desc="Text displayed inside a link when an app is installed. Clicking this link opens up the New Tab Page to show the app's icon.">
+        Show me
+      </message>
+
       <message name="IDS_EXTENSION_INSTALLED_PAGE_ACTION_INFO" desc="Text displayed in the InfoBubble which explains that the UI of this extension is a Page Action icon which may appear for some pages.">
         This icon will be visible when the extension can act on the current page.
       </message>
       <message name="IDS_EXTENSION_INSTALLED_OMNIBOX_KEYWORD_INFO" desc="Text displayed in the InfoBubble which explains that this extension has an keyword that can be used with the omnibox.">
         To use this extension, type "<ph name="EXTENSION_KEYWORD">$1<ex>search</ex></ph>", then TAB, then your command or search.
       </message>
 
       <message name="IDS_MANAGE_EXTENSIONS" desc="The 'Manage Extensions...' text in the context menu for when right-clicking on extension icons">
         Manage extensions...
       </message>
@@ skipping 411 matching lines @@
       </message>
       <message name="IDS_FLAGS_PRINT_PREVIEW_DESCRIPTION" desc="Description of the 'Print Preview' lab.">
         Enables an in-tab preview of a print operation.
       </message>
       <message name="IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_NAME" desc="Name of the 'Experimental Extension APIs' lab.">
         Experimental Extension APIs
       </message>
       <message name="IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_DESCRIPTION" desc="Description of the 'Experimental Extension APIs' lab.">
         Enables experimental extension APIs. Note that the extension gallery doesn't allow you to upload extensions that use experimental APIs.
       </message>
+      <message name="IDS_FLAGS_APPS_NEW_INSTALL_BUBBLE_NAME" desc="Name of the 'New Apps Install Bubble' lab">
+        New Apps Install Bubble
+      </message>
+      <message name="IDS_FLAGS_APPS_NEW_INSTALL_BUBBLE_DESCRIPTION" desc="Description of the 'New Apps Install Bubble' lab">
+        When installing an app, always show a bubble pointing at the new tab page button on the tabstrip instead of opening a new tab page.
+      </message>
       <message name="IDS_FLAGS_CLICK_TO_PLAY_NAME" desc="Name of the 'Click to play' lab.">
         Click to play
       </message>
       <message name="IDS_FLAGS_CLICK_TO_PLAY_DESCRIPTION" desc="Description of the 'Click to play' lab.">
         Enables a "click to play" option in the plug-in content settings.
       </message>
       <message name="IDS_FLAGS_DISABLE_HYPERLINK_AUDITING_NAME" desc="Name of the 'Disable hyperlink auditing' lab.">
         Disable hyperlink auditing
       </message>
       <message name="IDS_FLAGS_DISABLE_HYPERLINK_AUDITING_DESCRIPTION" desc="Description of the 'Disable hyperlink auditing' lab.">
@@ skipping 8995 matching lines @@
     </includes>
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>