Add link to themes gallery....

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 3227 matching lines @@
 
       <message name="IDS_THEMES_GROUP_NAME" desc="The title of the themes group">
         Themes:
       </message>
       <message name="IDS_THEMES_GTK_BUTTON" desc="The button to choose GTK colors and icons as the current theme.">
         Set to GTK+ theme
       </message>
       <message name="IDS_THEMES_RESET_BUTTON" desc="The button to reset your theme">
         Reset to default theme
       </message>
+      <message name="IDS_THEMES_GALLERY_BUTTON" desc="The button to get more themes">
+        Get themes
+      </message>
 
       <message name="IDS_OPTIONS_FONTSANDLANGUAGES_GROUP_NAME" desc="The label of the 'Fonts and Languages' group">
         Fonts and Languages:
       </message>
 
       <message name="IDS_OPTIONS_PROXIES_LABEL" desc="The info label for the 'Proxy settings' button">
         Set up a proxy to connect to the network.
       </message>
       <message name="IDS_OPTIONS_PROXIES_CONFIGURE_BUTTON" desc="The label of the 'Configure proxy settings' button">
         Change proxy settings
@@ skipping 936 matching lines @@
         </message>
         <!-- Help menu -->
         <message name="IDS_HELP_MAC" desc="The menu item to show help in the Help menu.">
           <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> Help
         </message> <!-- os == 'darwin' -->
       </if>
 
     </messages>
   </release>
 </grit>