Make Interaction Media Features MQ dynamic on Linux.

ui/events/devices/input_device.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_DEVICES_INPUT_DEVICE_H_
 #define UI_EVENTS_DEVICES_INPUT_DEVICE_H_
 
 #include <stdint.h>
 #include <string>
 
@@ skipping 27 matching lines @@
 
   // ID of the device. This ID is unique between all input devices.
   int id;
 
   // The type of the input device.
   InputDeviceType type;
 
   // Name of the device.
   std::string name;
 
+  // If the device is enabled, and whether events should be dispatched to UI.
+  bool enabled = false;
+
   // The path to the input device in the sysfs filesystem.
   base::FilePath sys_path;
 
   // USB-style device identifiers, where available, or 0 if unavailable.
   uint16_t vendor_id;
   uint16_t product_id;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_DEVICES_INPUT_DEVICE_H_