Initial framework setup and skeleton for BackgroundFetchContext

content/browser/background_fetch/background_fetch_data_manager.h

Index: content/browser/background_fetch/background_fetch_data_manager.h
diff --git a/content/browser/background_fetch/background_fetch_data_manager.h b/content/browser/background_fetch/background_fetch_data_manager.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_DATA_MANAGER_H_
+#define CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_DATA_MANAGER_H_
+
+#include <map>
+#include <string>
+
+#include "base/macros.h"
+#include "content/browser/background_fetch/fetch_request.h"
+#include "content/common/content_export.h"
+#include "url/origin.h"
+
+namespace content {
+
+class BackgroundFetchContext;
+
+// The BackgroundFetchDataManager keeps track of all of the outstanding requests
+// which are in process in the DownloadManager. When Chromium restarts, it is
+// responsibile for reconnecting all the in progress downloads with an observer
+// which will keep the metadata up to date.
+class CONTENT_EXPORT BackgroundFetchDataManager {
+ public:
+  explicit BackgroundFetchDataManager(
+      BackgroundFetchContext* background_fetch_context);
+  ~BackgroundFetchDataManager();
+
+  // Called by BackgroundFetchContext when a new request is started, this will
+  // store all of the necessary metadata to track the request.
+  void CreateRequest(const FetchRequest& fetch_request);
+
+ private:
+  // BackgroundFetchContext owns this BackgroundFetchDataManager, so the
+  // DataManager is guaranteed to be destructed before the Context.
+  BackgroundFetchContext* background_fetch_context_;
+
+  // Map from <sw_registration_id, tag> to the FetchRequest for that tag.
+  using FetchIdentifier = std::pair<int64_t, std::string>;
+  std::map<FetchIdentifier, FetchRequest> fetch_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundFetchDataManager);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_DATA_MANAGER_H_