PaymentApp: Add PaymentAppProvider class.

content/browser/payments/payment_app_provider_impl.h

Index: content/browser/payments/payment_app_provider_impl.h
diff --git a/content/browser/payments/payment_app_provider_impl.h b/content/browser/payments/payment_app_provider_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..127e181eef875d853b89a0b38181c618485692a1
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+++ b/content/browser/payments/payment_app_provider_impl.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 CONTENT_BROWSER_PAYMENTS_PAYMENT_APP_PROVIDER_IMPL_H_
+#define CONTENT_BROWSER_PAYMENTS_PAYMENT_APP_PROVIDER_IMPL_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "components/payments/payment_app.mojom.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/payment_app_provider.h"
+
+namespace content {
+
+class BrowserContext;
+
+class CONTENT_EXPORT PaymentAppProviderImpl : public PaymentAppProvider {
+ public:
+  static PaymentAppProviderImpl* GetInstance();
+
+  // PaymentAppProvider implementation:
+  // Should be accessed only on the UI thread.
+  void GetAllManifests(BrowserContext* browser_context,
+                       const GetAllManifestsCallback& callback) override;
+
+ private:
+  PaymentAppProviderImpl();
+  ~PaymentAppProviderImpl() override;
+
+  friend struct base::DefaultSingletonTraits<PaymentAppProviderImpl>;
+
+  DISALLOW_COPY_AND_ASSIGN(PaymentAppProviderImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_PAYMENTS_PAYMENT_APP_PROVIDER_IMPL_H_