Move touchscreen device caching to DeviceDataManager

ui/events/x/hotplug_event_handler_x11.h

+// Copyright 2014 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 UI_EVENTS_X_HOTPLUG_EVENT_HANDLER_H_
+#define UI_EVENTS_X_HOTPLUG_EVENT_HANDLER_H_
+
+#include "ui/events/x/device_list_cache_x.h"
+
+namespace ui {
+
+class DeviceHotplugEventObserver;
+
+// Parses X11 native devices and propagates the list of active devices to an
+// observer.
+class EVENTS_BASE_EXPORT HotplugEventHandlerX11 {
+ public:
+  explicit HotplugEventHandlerX11(DeviceHotplugEventObserver* delegate);
+  ~HotplugEventHandlerX11();
+
+  // Called on an X11 hotplug event.
+  void OnHotplugEvent();
+
+ private:
+  void HandleTouchscreenDevices(const XIDeviceList& device_list);
+
+  DeviceHotplugEventObserver* delegate_;  // Not owned.
+
+  DISALLOW_COPY_AND_ASSIGN(HotplugEventHandlerX11);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_X_HOTPLUG_EVENT_HANDLER_H_