Allow gaming_seat to use ozone gamepad as back-end

components/exo/gaming_seat_ozone.h

Index: components/exo/gaming_seat_ozone.h
diff --git a/components/exo/gaming_seat_ozone.h b/components/exo/gaming_seat_ozone.h
new file mode 100644
index 0000000000000000000000000000000000000000..91d9f7ec6436fff64d12b92af4f6d8c3fe679a8f
--- /dev/null
+++ b/components/exo/gaming_seat_ozone.h
@@ -0,0 +1,54 @@
+// 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 COMPONENTS_EXO_GAMING_SEAT_OZONE_H_
+#define COMPONENTS_EXO_GAMING_SEAT_OZONE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "components/exo/gaming_seat.h"
+#include "components/exo/wm_helper.h"
+#include "ui/events/ozone/gamepad/gamepad_observer.h"
+
+namespace ui {
+class GamepadProviderOzone;
+}
+
+namespace exo {
+class GamingSeatDelegate;
+class GamepadDelegate;
+
+class GamingSeatOzone : public GamingSeat, public ui::GamepadObserver {
+ public:
+  GamingSeatOzone(GamingSeatDelegate* delegate);
+
+  ~GamingSeatOzone() override;
+
+  // Overriden ui::GamepadObserver.
+  void OnGamepadDevicesUpdated() override;
+  void OnGamepadEvent(const ui::GamepadEvent& event) override;
+
+  // Overridden WMHelper::FocusObserver:
+  void OnWindowFocused(aura::Window* gained_focus,
+                       aura::Window* lost_focus) override;
+
+ private:
+  // Enable or disable this gaming seat.
+  void Enable(bool enable);
+
+  // The delegate that handles gamepad_added.
+  GamingSeatDelegate* const delegate_;
+
+  // This map maps device id to gamepad delegates.
+  std::map<int, GamepadDelegate*> gamepads_;
+
+  ui::GamepadProviderOzone* gamepad_provider_;
+
+  DISALLOW_COPY_AND_ASSIGN(GamingSeatOzone);
+};
+
+}  // namespace exo
+
+#endif  // COMPONENTS_EXO_GAMING_SEAT_JOYDEV_H_