[Payments] Implement web payment app manifest

content/browser/payments/payment_app_info_fetcher.h

Index: content/browser/payments/payment_app_info_fetcher.h
diff --git a/content/browser/payments/payment_app_info_fetcher.h b/content/browser/payments/payment_app_info_fetcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..6f24bdabdda7647da7d069c415570b4f552aa95a
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+++ b/content/browser/payments/payment_app_info_fetcher.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_INFO_FETCHER_H_
+#define CONTENT_BROWSER_PAYMENTS_PAYMENT_APP_INFO_FETCHER_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "content/browser/service_worker/service_worker_context_wrapper.h"
+#include "content/public/common/manifest.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+namespace content {
+
+class PaymentAppInfoFetcher
+    : public base::RefCountedThreadSafe<PaymentAppInfoFetcher> {
+ public:
+  PaymentAppInfoFetcher();
+
+  using PaymentAppInfoFetchCallback =
+      base::OnceCallback<void(const std::string&, const std::string&)>;
+  void Start(const GURL& context_url,
+             scoped_refptr<ServiceWorkerContextWrapper> service_worker_context,
+             PaymentAppInfoFetchCallback callback);
+
+ private:
+  friend class base::RefCountedThreadSafe<PaymentAppInfoFetcher>;
+  ~PaymentAppInfoFetcher();
+
+  void StartFromUIThread(
+      const std::unique_ptr<std::vector<std::pair<int, int>>>& provider_hosts);
+
+  // The WebContents::GetManifestCallback.
+  void FetchPaymentAppManifestCallback(const GURL& url,
+                                       const Manifest& manifest);
+
+  // The ManifestIconDownloader::IconFetchCallback.
+  void OnIconFetched(const SkBitmap& icon);
+  void PostPaymentAppInfoFetchResultToIOThread();
+  std::unique_ptr<std::vector<std::pair<int, int>>> GetProviderHostIds(
+      ServiceWorkerContextWrapper* service_worker_context,
+      const GURL& origin);
+
+  GURL context_url_;
+  PaymentAppInfoFetchCallback callback_;
+
+  int context_process_id_;
+  int context_frame_id_;
+  std::string fetched_payment_app_name_;
+  std::string fetched_payment_app_icon_;
+
+  DISALLOW_COPY_AND_ASSIGN(PaymentAppInfoFetcher);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_PAYMENTS_PAYMENT_APP_INFO_FETCHER_H_