[Autofill] Credit Card validation for rAc.

chrome/browser/autofill/validation.h

Index: chrome/browser/autofill/validation.h
diff --git a/chrome/browser/autofill/validation.h b/chrome/browser/autofill/validation.h
index f8e923bc837b283ce99814833d646f4af56c0611..93557b7b42f3881d21640af54a776fc64d5bc25c 100644
--- a/chrome/browser/autofill/validation.h
+++ b/chrome/browser/autofill/validation.h
@@ -13,6 +13,9 @@ namespace autofill {
 // Uses the Luhn formula to validate the number.
 bool IsValidCreditCardNumber(const string16& text);
 
+// Returns true if |text| looks like a valid credit card security code.
+bool IsValidCreditCardSecurityCode(const string16& text);
+
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_AUTOFILL_VALIDATION_H_