Use web-app manifest format for Android payment apps.

components/payments/content/payment_manifest_downloader.cc

 // 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.
 
 #include "components/payments/content/payment_manifest_downloader.h"
 
 #include <algorithm>
 #include <unordered_map>
 #include <utility>
 
@@ skipping 24 matching lines @@
     Delegate* delegate)
     : context_(context),
       method_name_(method_name),
       delegate_(delegate),
       is_downloading_http_link_header_(true) {
   DCHECK(IsValidManifestUrl(method_name_));
 }
 
 PaymentManifestDownloader::~PaymentManifestDownloader() {}
 
-void PaymentManifestDownloader::Download() {
+void PaymentManifestDownloader::DownloadPaymentMethodManifest() {
+  DCHECK(!fetcher_);
+  is_downloading_http_link_header_ = true;
   InitiateDownload(method_name_, net::URLFetcher::HEAD);
 }
 
+void PaymentManifestDownloader::DownloadWebAppManifest() {
+  DCHECK(!fetcher_);
+  is_downloading_http_link_header_ = false;
+  InitiateDownload(method_name_, net::URLFetcher::GET);
+}
+
 void PaymentManifestDownloader::InitiateDownload(
     const GURL& url,
     net::URLFetcher::RequestType request_type) {
   if (!IsValidManifestUrl(url)) {
     delegate_->OnManifestDownloadFailure();
     return;
   }
 
   fetcher_ = net::URLFetcher::Create(0 /* id */, url, request_type, this);
   data_use_measurement::DataUseUserData::AttachToFetcher(
@@ skipping 52 matching lines @@
     if (source->GetResponseAsString(&content) && !content.empty()) {
       delegate_->OnManifestDownloadSuccess(content);
       return;
     }
   }
 
   delegate_->OnManifestDownloadFailure();
 }
 
 }  // namespace payments