(Not for review) Dummy C++ side Custom Controls implementation

chrome/browser/media/router/mojo/media_route_controller.h

Index: chrome/browser/media/router/mojo/media_route_controller.h
diff --git a/chrome/browser/media/router/mojo/media_route_controller.h b/chrome/browser/media/router/mojo/media_route_controller.h
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+// 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.
+
+#ifndef CHROME_BROWSER_MEDIA_ROUTER_MOJO_MEDIA_ROUTE_CONTROLLER_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_MOJO_MEDIA_ROUTE_CONTROLLER_H_
+
+#include "chrome/browser/media/router/media_route.h"
+#include "chrome/browser/media/router/mojo/media_controller.mojom.h"
+#include "chrome/browser/media/router/mojo/media_status.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace media_router {
+
+namespace mojom {
+class MediaRouteProvider;
+}
+
+class MediaRouteStatusObserver;
+
+class MediaRouteController : public mojom::MediaStatusObserver {
+ public:
+  MediaRouteController(MediaRoute::Id route_id,
+                       mojom::MediaRouteProvider* provider,
+                       base::Callback<void()> destroyer_callback);
+  ~MediaRouteController() override;
+
+  void OnControllerSet(bool success);
+
+  void Play();
+  void Pause();
+  void Seek(uint32_t time);
+  void SetMute(bool mute);
+  void SetVolume(float volume);
+
+  void AddObserver(MediaRouteStatusObserver* observer);
+  void RemoveObserver(MediaRouteStatusObserver* observer);
+
+  // mojom::MediaStatusObserver:
+  void OnMediaStatusUpdated(mojom::MediaStatusPtr mojo_status) override;
+
+  void OnDummyMediaStatusUpdated();
+
+ private:
+  base::Callback<void()> destroyer_callback_;
+  mojom::MediaControllerPtr media_controller_;
+  std::unique_ptr<mojo::Binding<mojom::MediaStatusObserver>> binding_;
+  std::unordered_set<MediaRouteStatusObserver*> observers_;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_MOJO_MEDIA_ROUTE_CONTROLLER_H_