PaymentRequest.canMakePayment() query quota on desktop.

components/payments/content/can_make_payment_query_factory.h

Index: components/payments/content/can_make_payment_query_factory.h
diff --git a/components/payments/content/can_make_payment_query_factory.h b/components/payments/content/can_make_payment_query_factory.h
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+// 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_CAN_MAKE_PAYMENT_QUERY_FACTORY_H_
+#define COMPONENTS_PAYMENTS_CONTENT_CAN_MAKE_PAYMENT_QUERY_FACTORY_H_
+
+#include "base/macros.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace base {
+template <typename T>
+struct DefaultSingletonTraits;
+}
+
+namespace content {
+class BrowserContext;
+}
+
+namespace payments {
+
+class CanMakePaymentQuery;
+
+// Ensures that there's only one instance of CanMakePaymentQuery per browser
+// context.
+class CanMakePaymentQueryFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static CanMakePaymentQueryFactory* GetInstance();
+  CanMakePaymentQuery* GetForContext(content::BrowserContext* context);
+
+ private:
+  friend struct base::DefaultSingletonTraits<CanMakePaymentQueryFactory>;
+
+  CanMakePaymentQueryFactory();
+  ~CanMakePaymentQueryFactory() override;
+
+  // BrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(CanMakePaymentQueryFactory);
+};
+
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_CONTENT_CAN_MAKE_PAYMENT_QUERY_FACTORY_H_