Create the BackgroundFetchBatchManager and initiate a download.

content/browser/background_fetch/batch_request.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 "content/browser/background_fetch/batch_request.h"
+
+#include "base/guid.h"
+
+namespace content {
+
+BatchRequest::BatchRequest() = default;
+
+BatchRequest::BatchRequest(const std::string& tag,
+                           const url::Origin& origin,
+                           int64_t service_worker_registration_id)
+    : guid_(base::GenerateGUID()),
+      tag_(tag),
+      origin_(origin),
+      service_worker_registration_id_(service_worker_registration_id) {}
+
+BatchRequest::~BatchRequest() = default;
+
+}  // namespace content