Add card details and legal message to Android save credit card infobar.

components/autofill/core/browser/credit_card.cc

Index: components/autofill/core/browser/credit_card.cc
diff --git a/components/autofill/core/browser/credit_card.cc b/components/autofill/core/browser/credit_card.cc
index 232fca5dc92e1fc7b6abd0db7c57add4e5e1eac9..b7c80e28c13d495b98b24e5f34336f69fae61264 100644
--- a/components/autofill/core/browser/credit_card.cc
+++ b/components/autofill/core/browser/credit_card.cc
@@ -503,6 +503,15 @@ base::string16 CreditCard::TypeAndLastFourDigits() const {
   return type + base::UTF8ToUTF16("\xC2\xA0\xE2\x8B\xAF") + digits;
 }
 
+base::string16 CreditCard::AbbreviatedExpirationDateForDisplay() const {
+  base::string16 month = ExpirationMonthAsString();
+  base::string16 year = Expiration2DigitYearAsString();
+  return month.empty() || year.empty()
+             ? base::string16()
+             : l10n_util::GetStringFUTF16(
+                   IDS_AUTOFILL_CREDIT_CARD_EXPIRATION_DATE_ABBR, month, year);
+}
+
 void CreditCard::operator=(const CreditCard& credit_card) {
   set_use_count(credit_card.use_count());
   set_use_date(credit_card.use_date());