feat: preliminary support for //extensions (#17440)

shell/browser/extensions/atom_extension_system_factory.cc

@@ -0,0 +1,51 @@
+// Copyright 2014 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 "shell/browser/extensions/atom_extension_system_factory.h"
+
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "extensions/browser/extension_prefs_factory.h"
+#include "extensions/browser/extension_registry_factory.h"
+#include "shell/browser/extensions/atom_extension_system.h"
+
+using content::BrowserContext;
+
+namespace extensions {
+
+ExtensionSystem* AtomExtensionSystemFactory::GetForBrowserContext(
+    BrowserContext* context) {
+  return static_cast<AtomExtensionSystem*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
+}
+
+// static
+AtomExtensionSystemFactory* AtomExtensionSystemFactory::GetInstance() {
+  return base::Singleton<AtomExtensionSystemFactory>::get();
+}
+
+AtomExtensionSystemFactory::AtomExtensionSystemFactory()
+    : ExtensionSystemProvider("AtomExtensionSystem",
+                              BrowserContextDependencyManager::GetInstance()) {
+  DependsOn(ExtensionPrefsFactory::GetInstance());
+  DependsOn(ExtensionRegistryFactory::GetInstance());
+}
+
+AtomExtensionSystemFactory::~AtomExtensionSystemFactory() {}
+
+KeyedService* AtomExtensionSystemFactory::BuildServiceInstanceFor(
+    BrowserContext* context) const {
+  return new AtomExtensionSystem(context);
+}
+
+BrowserContext* AtomExtensionSystemFactory::GetBrowserContextToUse(
+    BrowserContext* context) const {
+  // Use a separate instance for incognito.
+  return context;
+}
+
+bool AtomExtensionSystemFactory::ServiceIsCreatedWithBrowserContext() const {
+  return true;
+}
+
+}  // namespace extensions