arc: Add ArcServiceManager to own all future ARC services

components/arc/arc_service_manager.cc

Index: components/arc/arc_service_manager.cc
diff --git a/components/arc/arc_service_manager.cc b/components/arc/arc_service_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..57c8da2f29e49b12a82e097856ce7e6120384cf7
--- /dev/null
+++ b/components/arc/arc_service_manager.cc
@@ -0,0 +1,49 @@
+// Copyright 2015 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 "components/arc/arc_service_manager.h"
+
+#include "base/sequenced_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+#include "components/arc/arc_bridge_service_impl.h"
+
+namespace arc {
+
+namespace {
+
+// Weak pointer.  This class is owned by ChromeBrowserMainPartsChromeos.
+ArcServiceManager* g_arc_service_manager = nullptr;
+
+}  // namespace
+
+ArcServiceManager::ArcServiceManager(
+    const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
+    const scoped_refptr<base::SequencedTaskRunner>& file_task_runner)
+    : origin_task_runner_(base::ThreadTaskRunnerHandle::Get()),
+      arc_bridge_service_(
+          new ArcBridgeServiceImpl(io_task_runner, file_task_runner)) {
+  DCHECK(!g_arc_service_manager);
+  g_arc_service_manager = this;
+}
+
+ArcServiceManager::~ArcServiceManager() {
+  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
+  DCHECK(g_arc_service_manager == this);
+  g_arc_service_manager = nullptr;
+}
+
+// static
+ArcServiceManager* ArcServiceManager::Get() {
+  DCHECK(
+      g_arc_service_manager->origin_task_runner_->RunsTasksOnCurrentThread());
+  DCHECK(g_arc_service_manager);
+  return g_arc_service_manager;
+}
+
+ArcBridgeService* ArcServiceManager::arc_bridge_service() {
+  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
+  return arc_bridge_service_.get();
+}
+
+}  // namespace arc