Add full touch support to mus.

services/ui/ws/touch_controller.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 SERVICES_UI_WS_TOUCH_CONTROLLER_H_
-#define SERVICES_UI_WS_TOUCH_CONTROLLER_H_
-
-#include "base/macros.h"
-#include "ui/events/devices/input_device_event_observer.h"
-
-namespace ui {
-namespace ws {
-
-class DisplayManager;
-
-// Tracks changes to displays and touchscreen devices. Updates the mapping
-// between display devices and touchscreen devices when changes occur.
-class TouchController : public ui::InputDeviceEventObserver {
- public:
-  explicit TouchController(DisplayManager* display_manager);
-  ~TouchController() override;
-
-  void UpdateTouchTransforms() const;
-
-  // ui::InputDeviceEventObserver:
-  void OnTouchscreenDeviceConfigurationChanged() override;
-
- private:
-  DisplayManager* display_manager_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchController);
-};
-
-}  // namespace ws
-}  // namespace ui
-
-#endif  // SERVICES_UI_WS_TOUCH_CONTROLLER_H_