Connect BackgroundFetch to the OfflineItemCollection

chrome/browser/background_fetch/background_fetch_client_impl.cc

Index: chrome/browser/background_fetch/background_fetch_client_impl.cc
diff --git a/chrome/browser/background_fetch/background_fetch_client_impl.cc b/chrome/browser/background_fetch/background_fetch_client_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..764bfd9dfaeefc09dd40dd7463788c777d83022d
--- /dev/null
+++ b/chrome/browser/background_fetch/background_fetch_client_impl.cc
@@ -0,0 +1,94 @@
+// 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 <string>
+
+#include "chrome/browser/background_fetch/background_fetch_client_impl.h"
+
+#include "chrome/browser/offline_items_collection/offline_content_aggregator_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/offline_items_collection/core/offline_content_aggregator.h"
+#include "components/offline_items_collection/core/offline_item.h"
+
+namespace {
+
+const char kBackgroundFetchProvider[] = "BackgroundFetchProvider";

[Peter Beverloo, 2017/03/29 14:32:12]

Please check with David to see what sort of string we should pass in. In either
case, s/Provider/Namespace/ since the argument (awkwardly) is called
"name_space".

[harkness, 2017/03/30 12:42:35]

Done.

+
+}  // namespace
+
+BackgroundFetchClientImpl::BackgroundFetchClientImpl(Profile* profile)
+    : profile_(profile) {
+  DCHECK(profile_);
+  offline_items_collection::OfflineContentAggregator* aggregator =
+      offline_items_collection::OfflineContentAggregatorFactory::
+          GetForBrowserContext(profile_);
+  if (!aggregator)
+    return;
+  aggregator->RegisterProvider(kBackgroundFetchProvider, this);
+}
+
+BackgroundFetchClientImpl::~BackgroundFetchClientImpl() {
+  offline_items_collection::OfflineContentAggregator* aggregator =
+      offline_items_collection::OfflineContentAggregatorFactory::
+          GetForBrowserContext(profile_);
+  if (!aggregator)
+    return;
+  aggregator->UnregisterProvider(kBackgroundFetchProvider);
+}
+
+void BackgroundFetchClientImpl::SetDelegate(
+    content::BackgroundFetchDelegate* delegate) {
+  delegate_ = delegate;
+}
+
+content::BackgroundFetchDelegate* BackgroundFetchClientImpl::GetDelegate()
+    const {
+  return delegate_;
+}
+
+void BackgroundFetchClientImpl::CancelDownload(const ContentId& id) {
+  if (id.name_space != kBackgroundFetchProvider)
+    return;

[Peter Beverloo, 2017/03/29 14:59:49]

These should be DCHECK_EQs. (The OCA only forwards these calls to the provider
with the given namespace.)

[harkness, 2017/03/30 12:42:34]

Done.

+
+  if (!delegate_)
+    return;
+
+  delegate_->CancelDownload(id.id);

[Peter Beverloo, 2017/03/29 14:32:12]

I realize this will make it even longer, but unless it makes wrapping very ugly
could we consider s/id/content_id/? id.id reads really odd.

[harkness, 2017/03/30 12:42:34]

Done.

+}
+
+void BackgroundFetchClientImpl::PauseDownload(const ContentId& id) {
+  if (id.name_space != kBackgroundFetchProvider)
+    return;
+
+  if (!delegate_)
+    return;
+
+  delegate_->PauseDownload(id.id);
+}
+
+void BackgroundFetchClientImpl::ResumeDownload(const ContentId& id) {
+  if (id.name_space != kBackgroundFetchProvider)
+    return;
+
+  if (!delegate_)
+    return;
+
+  delegate_->ResumeDownload(id.id);
+}
+
+// Not yet implemented.

[Peter Beverloo, 2017/03/29 14:32:12]

Will this be included in this CL? It would still be good to give each of these
methods a body with a TODO saying what's going to happen to them.

(Fwiw, I support doing this in multiple steps.)

[harkness, 2017/03/30 12:42:34]

Done.

+bool BackgroundFetchClientImpl::AreItemsAvailable() {
+  return false;
+}

[Peter Beverloo, 2017/03/29 14:32:12]

micro nit: blank lines between the methods

[harkness, 2017/03/30 12:42:35]

Done.

+void BackgroundFetchClientImpl::OpenItem(const ContentId& id) {}
+void BackgroundFetchClientImpl::RemoveItem(const ContentId& id) {}
+void BackgroundFetchClientImpl::AddObserver(Observer* observer) {}
+void BackgroundFetchClientImpl::RemoveObserver(Observer* observer) {}
+const OfflineItem* BackgroundFetchClientImpl::GetItemById(const ContentId& id) {
+  return nullptr;
+}
+OfflineContentProvider::OfflineItemList
+BackgroundFetchClientImpl::GetAllItems() {
+  return OfflineContentProvider::OfflineItemList();
+}