Create MediaRouterActionController and MediaRouterUIService

chrome/browser/media/router/media_router_ui_service.h

+// Copyright 2016 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.
+
+#ifndef CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_UI_SERVICE_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_UI_SERVICE_H_
+
+#include <memory>
+
+#include "chrome/browser/ui/toolbar/media_router_action_controller.h"
+#include "components/keyed_service/core/keyed_service.h"
+
+class Profile;
+
+namespace media_router {
+
+// Service that owns per-profile Media Router UI objects, such as the controller
+// for the Media Router toolbar action.
+class MediaRouterUIService : public KeyedService {
+ public:
+  explicit MediaRouterUIService(Profile* profile);
+  ~MediaRouterUIService() override;
+
+  static MediaRouterUIService* Get(Profile* profile);
+
+ private:
+  MediaRouterActionController action_controller_;

[Devlin, 2016/09/15 21:08:41]

I'm a bit confused about why we have a service that owns a controller, rather
than having the controller itself be a keyed service.  Is there more
functionality that will be in this class in the future?

[takumif, 2016/09/16 21:04:05]

Yes, the plan is to be able to add other MR UI related objects that should
persist.

+
+  DISALLOW_COPY_AND_ASSIGN(MediaRouterUIService);
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_UI_SERVICE_H_