Add an abstraction for a job in the AppCacheRequestHandler class.

content/browser/appcache/appcache_job.cc

+// Copyright (c) 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/appcache/appcache_job.h"
+#include "content/browser/appcache/appcache_request.h"
+#include "content/browser/appcache/appcache_url_loader_job.h"
+#include "content/browser/appcache/appcache_url_request_job.h"
+
+namespace content {
+
+std::unique_ptr<AppCacheJob> AppCacheJob::Create(
+    kJobType job_type,
+    bool is_main_resource,
+    AppCacheHost* host,
+    AppCacheStorage* storage,
+    AppCacheRequest* request,
+    net::NetworkDelegate* network_delegate,
+    const OnPrepareToRestartCallback& restart_callback) {
+  std::unique_ptr<AppCacheJob> job;
+  if (job_type == kJobType::URL_REQUEST_JOB) {
+    job.reset(new AppCacheURLRequestJob(request->GetURLRequest(),
+                                        network_delegate, storage, host,
+                                        is_main_resource, restart_callback));
+  } else if (job_type == kJobType::URL_LOADER_JOB) {
+    job.reset(new AppCacheURLLoaderJob);
+  } else {
+    NOTREACHED();
+  }
+  return job;
+}
+
+AppCacheJob::~AppCacheJob() {}
+
+base::WeakPtr<AppCacheJob> AppCacheJob::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
+net::URLRequestJob* AppCacheJob::AsURLRequestJob() {
+  return nullptr;
+}
+
+AppCacheJob::AppCacheJob() : weak_factory_(this) {}
+
+}  // namespace content