[Payments] After adding/editing a credit card, instrument is selected.

components/payments/content/payment_request_state.h

Index: components/payments/content/payment_request_state.h
diff --git a/components/payments/content/payment_request_state.h b/components/payments/content/payment_request_state.h
index f1d067bbeac2251eea2664d19b9d3f572a02b0c1..90b5fde5c6a7422f869ea9ff8e99520c6705a388 100644
--- a/components/payments/content/payment_request_state.h
+++ b/components/payments/content/payment_request_state.h
@@ -16,6 +16,7 @@
 
 namespace autofill {
 class AutofillProfile;
+class CreditCard;
 class PersonalDataManager;
 }  // namespace autofill
 
@@ -111,6 +112,12 @@ class PaymentRequestState : public PaymentInstrument::Delegate {
     return available_instruments_;
   }
 
+  // Creates and adds an AutofillPaymentInstrument, which makes a copy of
+  // |card|. |selected| indicates if the newly-created instrument should be
+  // selected, after which observers will be notified.
+  void AddAutofillPaymentInstrument(bool selected,
+                                    const autofill::CreditCard& card);
+
   // Setters to change the selected information. Will have the side effect of
   // recomputing "is ready to pay" and notify observers.
   void SetSelectedShippingOption(const std::string& shipping_option_id);