[Payment Request] Makes sure only complete credit cards can be selected

ios/chrome/browser/payments/payment_request_util.h

Index: ios/chrome/browser/payments/payment_request_util.h
diff --git a/ios/chrome/browser/payments/payment_request_util.h b/ios/chrome/browser/payments/payment_request_util.h
index 88fd9ee0b838b508ada0d8f1947f39e3871f82f0..3bbb6d698a533241f8eb09165da45ede6e28cf88 100644
--- a/ios/chrome/browser/payments/payment_request_util.h
+++ b/ios/chrome/browser/payments/payment_request_util.h
@@ -7,11 +7,14 @@
 
 #import <Foundation/Foundation.h>
 
+#include <vector>
+
 #include "base/strings/string16.h"
 #include "components/payments/core/payment_options_provider.h"
 
 namespace autofill {
 class AutofillProfile;
+class CreditCard;
 }  // namespace autofill
 
 class PaymentRequest;
@@ -49,6 +52,18 @@ NSString* GetAddressNotificationLabelFromAutofillProfile(
     PaymentRequest& payment_request,
     const autofill::AutofillProfile& profile);
 
+// Returns whether the credit card is complete to be used as a payment method
+// without further editing.
+BOOL IsCreditCardCompleteForPayment(
+    const autofill::CreditCard& credit_card,
+    const std::vector<autofill::AutofillProfile*>& billing_profiles);
+
+// Helper function to create a notification label for what's missing from a
+// credit card. Returns nil if the resulting label is empty.
+NSString* GetPaymentMethodNotificationLabelFromCreditCard(
+    const autofill::CreditCard& credit_card,
+    const std::vector<autofill::AutofillProfile*>& billing_profiles);
+
 // Returns the title for the shipping section of the payment summary view given
 // the shipping type specified in |payment_request|.
 NSString* GetShippingSectionTitle(payments::PaymentShippingType shipping_type);