Implement the Request/Response bits of Background Fetch

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchRequest.cpp

+// 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 "modules/background_fetch/BackgroundFetchRequest.h"
+
+#include "modules/fetch/Request.h"
+
+namespace blink {
+
+BackgroundFetchRequest::BackgroundFetchRequest(Request* request)
+    : m_request(request) {}
+
+Request* BackgroundFetchRequest::request() const {
+  return m_request;
+}
+
+DEFINE_TRACE(BackgroundFetchRequest) {
+  visitor->trace(m_request);
+}
+
+}  // namespace blink