Add a help bubble pointing to the omnibox when installing an extension with

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. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 3690 matching lines @@
       </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_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.">
+        Type "<ph name="EXTENSION_KEYWORD">$1<ex>search</ex></ph>" into the URL bar to send commands to this extension.

[Aaron Boodman, 2010/11/11 02:57:14]

How about:

To use it, type "<keyword>", then TAB, then your search string.

+      </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>
       <message name="IDS_EXTENSION_INSTALLED_MANAGE_INFO" desc="Text displayed in the InfoBubble with instructions on how to find the chrome://extensions/ management page">
         You can manage your installed extensions by clicking Extensions in the Tools menu.
       </message>
       <message name="IDS_EXTENSION_INSTALLED_MANAGE_INFO_MAC" desc="Text displayed in the InfoBubble with instructions on how to find the chrome://extensions/ management page on MAC OS X">
         You can manage your installed extensions by clicking Extensions in the Window menu.
       </message>
@@ skipping 7278 matching lines @@
 
     </messages>
 
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>