Initial framework setup and skeleton for BackgroundFetchContext

content/browser/background_fetch/background_fetch_data_manager.h

+// 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 "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:
+  BackgroundFetchDataManager(BackgroundFetchContext* background_fetch_context);

[Peter Beverloo, 2017/02/13 18:35:06]

nit: explicit

[harkness, 2017/02/14 13:52:46]

Done.

+  ~BackgroundFetchDataManager();
+
+  void CreateRequest(const FetchRequest& fetch_request);

[Peter Beverloo, 2017/02/13 18:35:06]

nit: This is a public method, please document it

[harkness, 2017/02/14 13:52:46]

Done.

+
+ private:
+  BackgroundFetchContext* background_fetch_context_;

[Peter Beverloo, 2017/02/13 18:35:05]

Raw pointers need a line of documentation about why it's safe to have a raw
pointer. (Your unit test is now leaking memory.)

[harkness, 2017/02/14 13:52:46]

Done.

+
+  // Map from <Origin, tag> to the FetchRequest for that tag.
+  using FetchIdentifier = std::pair<url::Origin, std::string>;
+  std::map<FetchIdentifier, FetchRequest> fetch_map_;

[Peter Beverloo, 2017/02/13 18:35:06]

We know this to be functionally wrong - fetches will be scoped by Service Worker
Registration ID, not by origin. Can we skip this intermediate step and just use
an int64_t?

[harkness, 2017/02/14 13:52:46]

Done.

+};

[Peter Beverloo, 2017/02/13 18:35:06]

DISALLOW_COPY_AND_ASSIGN()

[harkness, 2017/02/14 13:52:46]

Done.

+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_DATA_MANAGER_H_