[Payments] Return the preferred payment method name to the merchant

components/payments/content/payment_request_state.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_
 #define COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "components/payments/content/payment_request.mojom.h"
 #include "components/payments/core/payment_instrument.h"
 
 namespace autofill {
 class AutofillProfile;
 class PersonalDataManager;
 }  // namespace autofill
 
 namespace payments {
 
 class PaymentRequestSpec;
 
+// Identifier for the BasicCard payment method.
+extern const char kBasicCardMethodName[];
+
 // Keeps track of the information currently selected by the user and whether the
 // user is ready to pay. Uses information from the PaymentRequestSpec, which is
 // what the merchant has specified, as input into the "is ready to pay"
 // computation.
 class PaymentRequestState : public PaymentInstrument::Delegate {
  public:
   // Any class call add itself as Observer via AddObserver() and receive
   // notification about the state changing.
   class Observer {
    public:
@@ skipping 137 matching lines @@
   std::vector<std::unique_ptr<PaymentInstrument>> available_instruments_;
 
   base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestState);
 };
 
 }  // namespace payments
 
 #endif  // COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_