Create the BackgroundFetchBatchManager and initiate a download.

content/browser/background_fetch/background_fetch_job_data.h

Index: content/browser/background_fetch/background_fetch_job_data.h
diff --git a/content/browser/background_fetch/background_fetch_job_data.h b/content/browser/background_fetch/background_fetch_job_data.h
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index 0000000000000000000000000000000000000000..61653b350d7d973ea5afa9fd78895bb197df9456
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+++ b/content/browser/background_fetch/background_fetch_job_data.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_BACKGROUND_FETCH_BACKGROUND_FETCH_JOB_DATA_H_
+#define CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_JOB_DATA_H_
+
+#include <string>
+#include <unordered_map>
+
+#include "base/macros.h"
+#include "content/browser/background_fetch/background_fetch_request_info.h"
+#include "content/common/content_export.h"
+#include "url/origin.h"
+
+namespace content {
+
+// The BackgroundFetchJobData class provides the interface from the
+// JobController to the data storage in the DataManager. It has a reference
+// to the DataManager and invokes calls given the stored batch_guid.
+class CONTENT_EXPORT BackgroundFetchJobData {
+ public:
+  explicit BackgroundFetchJobData(BackgroundFetchRequestInfos request_infos);
+  ~BackgroundFetchJobData();
+
+  // Called by the JobController to inform the JobData that the given fetch
+  // has completed. The JobData returns a boolean indicating whether there
+  // are more requests to process.
+  bool BackgroundFetchRequestInfoComplete(const std::string& fetch_guid);
+
+  // Called by the JobController to get a BackgroundFetchRequestInfo to
+  // process.
+  const BackgroundFetchRequestInfo& GetNextBackgroundFetchRequestInfo();
+
+  // Indicates whether all requests have been handed to the JobController.
+  bool HasRequestsRemaining() const;
+
+  // Indicates whether all requests have been handed out and completed.
+  bool IsComplete() const;
+
+ private:
+  BackgroundFetchRequestInfos request_infos_;
+
+  // Map from fetch_guid to index in request_infos_. Only currently
+  // outstanding requests should be in this map.
+  std::unordered_map<std::string, int> request_info_index_;
+  size_t next_request_info_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundFetchJobData);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_JOB_DATA_H_