Initial framework setup and skeleton for BackgroundFetchContext

content/browser/background_fetch/background_fetch_context.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_context.h"
+
+#include "content/browser/background_fetch/fetch_request.h"
+#include "content/browser/service_worker/service_worker_context_wrapper.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 {
+
+BackgroundFetchContext::BackgroundFetchContext(
+    BrowserContext* browser_context,
+    const scoped_refptr<ServiceWorkerContextWrapper>& service_worker_context)
+    : browser_context_(browser_context),
+      service_worker_context_(service_worker_context),
+      background_fetch_data_manager_(this) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  service_worker_context_->AddObserver(this);
+}
+
+BackgroundFetchContext::~BackgroundFetchContext() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  service_worker_context_->RemoveObserver(this);
+}
+
+void BackgroundFetchContext::Init() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  // TODO(harkness) Create the Download observer.
+  // TODO(harkness) Create the Data manager.

[Peter Beverloo, 2017/02/13 18:35:05]

nit: delete (see line 21)

[harkness, 2017/02/14 13:52:46]

Done.

+  // TODO(harkness) Create the Batch manager.
+}
+
+void BackgroundFetchContext::Shutdown() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+}
+
+void BackgroundFetchContext::OnRegistrationDeleted(int64_t registration_id,
+                                                   const GURL& pattern) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  // TODO(harkness) Call into the data manager and delete metadata, this will
+  // a call to the DownloadManager to abort any ongoing downloads.
+}
+
+void BackgroundFetchContext::CreateRequest(const FetchRequest& fetch_request) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  // Inform the data manager about the new download.
+  background_fetch_data_manager_.CreateRequest(fetch_request);
+
+  // Now make the request to the download manager.
+  // TODO(harkness) Replace this with a call to the batch manager once that is
+  // available.
+  content::StoragePartition* storage_partition =

[Peter Beverloo, 2017/02/13 18:35:05]

drop `content::` everywhere - you are in that namespace

Taking a step back, all of lines 58-67 should probably not be in this patch.
We're getting a storage partition, then allocating a DownloadUrlParameters
object with its request context, only to delete it immediately after.

[harkness, 2017/02/14 13:52:46]

Done.

+      content::BrowserContext::GetStoragePartitionForSite(
+          browser_context_, GURL(fetch_request.origin().Serialize()));
+  std::unique_ptr<content::DownloadUrlParameters> params(
+      new content::DownloadUrlParameters(
+          GURL(fetch_request.url().Serialize()),
+          storage_partition->GetURLRequestContext()));
+  // TODO(harkness) Set up the callback and start the download.
+}
+
+}  // namespace content