Create the BackgroundFetchBatchManager and initiate a download.

content/browser/background_fetch/background_fetch_job_controller.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/background_fetch_job_controller.h"
+
+#include <string>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/memory/ptr_util.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/download_manager.h"
+#include "content/public/browser/storage_partition.h"
+
+namespace content {
+
+BackgroundFetchJobController::BackgroundFetchJobController(
+    BrowserContext* browser_context,
+    StoragePartition* storage_partition)
+    : browser_context_(browser_context),
+      storage_partition_(storage_partition) {}
+
+BackgroundFetchJobController::~BackgroundFetchJobController() = default;
+
+void BackgroundFetchJobController::ProcessJob(
+    const std::string& job_guid,
+    BackgroundFetchJobData* job_data) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(job_data);
+  const BackgroundFetchRequestInfo& fetch_request =
+      job_data->GetNextBackgroundFetchRequestInfo();
+  ProcessRequest(job_guid, fetch_request);
+
+  // Currently this only supports jobs of size 1.
+  // TODO(crbug.com/692544)
+  DCHECK(!job_data->HasRequestsRemaining());
+
+  // TODO(harkness): Save the BackgroundFetchJobData so that when the download
+  // completes we can notify the DataManager.
+}
+
+void BackgroundFetchJobController::ProcessRequest(
+    const std::string& job_guid,
+    const BackgroundFetchRequestInfo& fetch_request) {
+  // First add the new request to the internal map tracking in-progress
+  // requests.
+  fetch_map_[job_guid] = fetch_request;
+
+  // TODO(harkness): Check if the download is already in progress or completed.
+
+  // Send the fetch request to the DownloadManager.
+  std::unique_ptr<DownloadUrlParameters> params(
+      base::MakeUnique<DownloadUrlParameters>(
+          fetch_request.url(), storage_partition_->GetURLRequestContext()));
+  // TODO(harkness): Currently this is the only place the browser_context is
+  // used. Evaluate whether we can just pass in the download manager explicitly.
+  BrowserContext::GetDownloadManager(browser_context_)
+      ->DownloadUrl(std::move(params));
+}
+
+}  // namespace content