[Resources] Add the Roboto font for contextual_search_promo_source and localize strings.

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 1196 matching lines @@
           Chromium (mDNS-In)
         </message>
         <message name="IDS_INBOUND_MDNS_RULE_DESCRIPTION" desc="The description of the firewall rule allowing inbound mDNS traffic.">
           Inbound rule for Chromium to allow mDNS traffic.
         </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_PROMO_DESCRIPTION" desc="Description of the Contextual Search feature.">
+        Enabling "Tap to Search" provides an easy way to search for terms on a web page by simply tapping on them.  The word tapped and surrounding page will be sent to Google.
+      </message>
+      <message name="IDS_CONTEXTUAL_SEARCH_PROMO_OPTIN" desc="Text for the button the user clicks to opt in.">
+        Yes, please
+      </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.">
         Reinstall Chromium
       </message>
       <if expr="use_titlecase">
         <message name="IDS_UPGRADE_BUBBLE_MENU_ITEM" desc="In Title Case: Text for the Chrome menu option replacing Update required.">
           Chromium is Out of Date
         </message>
       </if>
       <if expr="not use_titlecase">
@@ skipping 43 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>