Moving input device hotplug event processing outside of ui/display

ui/events/x/device_data_manager_x11.h

 // Copyright 2013 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_DEVICE_DATA_MANAGER_X11_H_
 #define UI_EVENTS_X_DEVICE_DATA_MANAGER_X11_H_
 
 // Generically-named #defines from Xlib is conflicting with symbols in GTest.
 // So many tests .cc file #undef Bool before including device_data_manager.h,
 // which makes Bool unrecognized in XInput2.h.
@@ skipping 206 matching lines @@
   // to have safe default values for testing.
   void SetDeviceListForTest(const std::vector<unsigned int>& touchscreen,
                             const std::vector<unsigned int>& cmt_devices);
 
   void SetValuatorDataForTest(XIDeviceEvent* xievent,
                               DataType type,
                               double value);
 
   bool TouchEventNeedsCalibrate(int touch_device_id) const;
 
+  // DeviceDataManager overrides:
+  virtual std::vector<TouchscreenDevice> GetTouchscreenDevices() OVERRIDE;
+
  private:
   // Initialize the XInput related system information.
   bool InitializeXInputInternal();
 
   // Check if an XI event contains data of the specified type.
   bool HasEventData(const XIDeviceEvent* xiev, const DataType type) const;
 
   void InitializeValuatorsForTest(int deviceid,
                                   int start_valuator,
                                   int end_valuator,
@@ skipping 44 matching lines @@
 
   unsigned char button_map_[256];
   int button_map_count_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceDataManagerX11);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_X_DEVICE_DATA_MANAGER_X11_H_