[Search] Make the feature name link to a learn more screen in the first-run experience.

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 These strings will not be translated and only english versions will
 be available for now. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 1187 matching lines @@
         </message>
         <message name="IDS_INBOUND_MDNS_RULE_DESCRIPTION_CANARY" desc="The description of the firewall rule allowing inbound mDNS traffic canary.">
           Inbound rule for Chromium to allow mDNS traffic.
         </message>
       </if>
 
       <!-- Contextual Search -->
       <message name="IDS_CONTEXTUAL_SEARCH_HEADER" desc="Header shown at the top of the first run experience, to describe the Contextual Search feature.">
         Search with one touch
       </message>
-      <message name="IDS_CONTEXTUAL_SEARCH_PROMO_DESCRIPTION" desc="Description of the Contextual Search feature.">
-        Using “Touch to Search” you can touch any word on a website to learn more about a topic. Chromium will send that word and the surrounding contents to Google and bring back relevant information about it.
+      <message name="IDS_CONTEXTUAL_SEARCH_PROMO_DESCRIPTION_1" desc="Part 1 of the description of the Contextual Search feature. Combined with FEATURE_NAME and DESCRIPTION_2 below, the whole should be a paragraph describing the feature. This line can be empty if it makes sense to start the sentence with FEATURE_NAME.">
+        Learn about topics on websites without leaving your browser.
+      </message>
+      <message name="IDS_CONTEXTUAL_SEARCH_PROMO_FEATURE_NAME" desc="Name of the Contextual Search feature. See explanation in DESCRIPTION_1.">
+        Tap to Search
+      </message>
+      <message name="IDS_CONTEXTUAL_SEARCH_PROMO_DESCRIPTION_2" desc="Part 2 of the description of the Contextual Search feature. See explanation in DESCRIPTION_1.">
+        sends a word and its surrounding context to Google Search, returning definitions, pictures, search results, and other details.
       </message>
       <message name="IDS_CONTEXTUAL_SEARCH_PROMO_OPTIN" desc="Text for the button the user clicks to opt in.">
         Accept &amp; Search
       </message>
       <message name="IDS_CONTEXTUAL_SEARCH_PROMO_OPTOUT" desc="Text for the button the user clicks to opt out.">
         No Thanks
       </message>
 
       <!-- Update bubble -->
       <message name="IDS_REINSTALL_APP" desc="Text for the button the user clicks to reinstall the app.">
@@ skipping 61 matching lines @@
           Chromium updates automatically so you always have the freshest version. When this download completes, Chromium will restart and you'll be on your way.
         </message>
         <message name="IDS_EULA_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE EULA screen">
           Chromium OS terms
         </message>
       </if>
 
     </messages>
   </release>
 </grit>