[autofill] Hook the sign-in button up to required actions.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index a197e93b9c90c0d56d1b8775f4b0076880284c90..0ce29b7080786c87f94cc743d95f3825d03a0ba8 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -10902,6 +10902,9 @@ experiment id: "<ph name="EXPERIMENT_ID">$5<ex>ar1</ex></ph>"
       <message name="IDS_AUTOFILL_DIALOG_SITE_WARNING" desc="Text that explains that user data will be sent to the site.">
         The following details will be shared with <ph name="SITE">$1<ex>www.shopping.com</ex></ph>
       </message>
+      <message name="IDS_AUTOFILL_DIALOG_VERIFY_CVV" desc="Text explaining that the user needs to enter their credit card's verification code before they can continue their transaction.">
+        For your security, please verify your card details.
+      </message>
       <message name="IDS_AUTOFILL_DIALOG_SECTION_EMAIL" desc="Label for the email section of the imperative autofill dialog.">
         Email address
       </message>