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

components/payments/content/payment_request_spec.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_SPEC_H_
 #define COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_SPEC_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 35 matching lines @@
   bool request_payer_name() const { return options_->request_payer_name; }
   bool request_payer_phone() const { return options_->request_payer_phone; }
   bool request_payer_email() const { return options_->request_payer_email; }
 
   const std::vector<std::string>& supported_card_networks() const {
     return supported_card_networks_;
   }
   const std::set<std::string>& supported_card_networks_set() const {
     return supported_card_networks_set_;
   }
+  // Returns whether the |method_name| was specified as supported through the
+  // "basic-card" payment method. If false, it means either the |method_name| is
+  // not supported at all, or specified directly in supportedMethods.
+  bool IsMethodSupportedThroughBasicCard(const std::string& method_name);
 
   // Uses CurrencyFormatter to format |amount| with the currency symbol for this
   // request's currency. Will use currency of the "total" display item, because
   // all items are supposed to have the same currency in a given request.
   base::string16 GetFormattedCurrencyAmount(const std::string& amount);
 
   // Uses CurrencyFormatter to get the formatted currency code for this
   // request's currency. Will use currency of the "total" display item, because
   // all items are supposed to have the same currency in a given request.
   std::string GetFormattedCurrencyCode();
@@ skipping 22 matching lines @@
   mojom::PaymentDetailsPtr details_;
   const std::string app_locale_;
   std::unique_ptr<CurrencyFormatter> currency_formatter_;
 
   // A list/set of supported basic card networks. The list is used to keep the
   // order in which they were specified by the merchant. The set is used for
   // fast lookup of supported methods.
   std::vector<std::string> supported_card_networks_;
   std::set<std::string> supported_card_networks_set_;
 
+  // Only the set of basic-card specified networks. NOTE: callers should use
+  // |supported_card_networks_set_| to check merchant support.
+  std::set<std::string> basic_card_specified_networks_;
+
   base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestSpec);
 };
 
 }  // namespace payments
 
 #endif  // COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_SPEC_H_