Add slave touch device to touch_device_lookup_ and touch_device_list_

ui/events/devices/x11/touch_factory_x11.h

 // Copyright (c) 2012 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_DEVICES_X11_TOUCH_FACTORY_X11_H_
 #define UI_EVENTS_DEVICES_X11_TOUCH_FACTORY_X11_H_
 
 #include <stdint.h>
 
 #include <bitset>
@@ skipping 103 matching lines @@
   // and instead of having the lookup table and the list, there will be a single
   // identifier for the touch device. This can be completed after enough testing
   // on real touch devices.
 
   static const int kMaxDeviceNum = 128;
 
   // A quick lookup table for determining if events from the pointer device
   // should be processed.
   std::bitset<kMaxDeviceNum> pointer_device_lookup_;
 
-  // A quick lookup table for determining if a device is a touch device.
-  std::bitset<kMaxDeviceNum> touch_device_lookup_;
-
   // The list of touch devices. For testing/debugging purposes, a single-pointer
   // device (mouse or touch screen without sufficient X/driver support for MT)
   // can sometimes be treated as a touch device. The key in the map represents
   // the device id, and the value represents if the device is multi-touch
   // capable.
   std::map<int, bool> touch_device_list_;
 
   // Touch screen <vid, pid>s.
   std::set<std::pair<int, int> > touchscreen_ids_;
 
   // Device ID of the virtual core keyboard.
   int virtual_core_keyboard_device_;
 
   SequentialIDGenerator id_generator_;
 
   // Associate each device ID with its master device ID.
   std::map<int, int> device_master_id_list_;
 
   // The status of the touch screens devices themselves.
   bool touch_screens_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchFactory);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_DEVICES_X11_TOUCH_FACTORY_X11_H_