Connect BackgroundFetch to the OfflineItemCollection

content/browser/background_fetch/background_fetch_client_proxy.h

Index: content/browser/background_fetch/background_fetch_client_proxy.h
diff --git a/content/browser/background_fetch/background_fetch_client_proxy.h b/content/browser/background_fetch/background_fetch_client_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..3f57db173d3c6c4e15c8769a28ed7e4e8e9ef7be
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+++ b/content/browser/background_fetch/background_fetch_client_proxy.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_CLIENT_PROXY_H_
+#define CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CLIENT_PROXY_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "content/public/browser/background_fetch_client.h"
+
+namespace content {
+
+class BackgroundFetchContext;
+
+// The BackgroundFetchClientProxy exists to proxy calls from the
+// BackgroundFetchContext, which lives on the IO thread, to the
+// BackgroundFetchClient which lives on the UI thread and back through the
+// BackgroundFetchClient::Delegate.
+class CONTENT_EXPORT BackgroundFetchClientProxy
+    : public BackgroundFetchClient::Delegate {
+ public:
+  explicit BackgroundFetchClientProxy(BackgroundFetchContext* context);
+  ~BackgroundFetchClientProxy() override;
+
+  // BackgroundFetchClient::Delegate implementation.
+  void CleanupAllTasks() override;
+  void CancelDownload(const std::string& registration_id) override;
+  void PauseDownload(const std::string& registration_id) override;
+  void ResumeDownload(const std::string& registration_id) override;
+
+ private:
+  // The BackgroundFetchClientProxy is owned by the BackgroundFetchContext.
+  BackgroundFetchContext* background_fetch_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundFetchClientProxy);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CLIENT_PROXY_H_