[Autofill] Implement Credit Card Signin Promo

components/autofill_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
 
   <if expr="not is_ios">
     <message name="IDS_AUTOFILL_CLEAR_FORM_MENU_ITEM" desc="The entry in the suggestions dropdown that clears an auto-filled form.">
       Clear form
     </message>
   </if>
   <if expr="is_ios">
     <message name="IDS_AUTOFILL_CLEAR_FORM_MENU_ITEM" desc="iOS: The entry in the suggestions keyboard accessory that clears an auto-filled form.">
       CLEAR FORM
     </message>
   </if>
   <message name="IDS_AUTOFILL_CLEAR_LOCAL_COPY_BUTTON" desc="The label of the button that clears the local copy of a Wallet Credit Card." formatter_data="android_java">
     Clear copy
   </message>
   <message name="IDS_AUTOFILL_WARNING_FORM_DISABLED" desc="Warning text to show when autofill is disabled by the website for a given form.">
     This webpage has disabled automatic filling for this form.
   </message>
   <message name="IDS_AUTOFILL_WARNING_INSECURE_CONNECTION" desc="Warning text to show when credit card autofill is disabled because the website is not using a secure connection.">
     Automatic credit card filling is disabled because this form does not use a secure connection.
   </message>
+  <message name="IDS_AUTOFILL_CREDIT_CARD_SIGNIN_PROMO" desc="Promo text shown alongside credit card suggestions to get people to sign in.">
+    Sign in to Chrome to use cards you saved to your Google Account.
+  </message>
   <if expr="_google_chrome">
     <message name="IDS_AUTOFILL_DELETE_AUTOCOMPLETE_SUGGESTION_CONFIRMATION_BODY" desc="Text in a dialog to confirm that the user wants to delete an autocomplete form history suggestion.">
       Remove form suggestion from Chrome?
     </message>
     <message name="IDS_AUTOFILL_DELETE_CREDIT_CARD_SUGGESTION_CONFIRMATION_BODY" desc="Text in a dialog to confirm that the user wants to delete a credit card from Autofill.">
       Remove credit card from Chrome?
     </message>
     <message name="IDS_AUTOFILL_DELETE_PROFILE_SUGGESTION_CONFIRMATION_BODY" desc="Text in a dialog to confirm that the user wants to delete an address from Autofill.">
       Remove address from Chrome?
     </message>
@@ skipping 251 matching lines @@
     /
   </message>
   <message name="IDS_AUTOFILL_CARD_UNMASK_NEW_CARD_LINK" desc="Text for link that prompts user to update their credit card after it may have been re-issued." formatter_data="android_java">
     New card?
   </message>
   <message name="IDS_AUTOFILL_DIALOG_PLACEHOLDER_CVC" desc="The placeholder/label text for credit card verification code in the requestAutocomplete dialog.">
     CVC
   </message>
 
 </grit-part>