Make Interaction Media Features MQ dynamic on Linux.

ui/events/devices/input_device.h

Index: ui/events/devices/input_device.h
diff --git a/ui/events/devices/input_device.h b/ui/events/devices/input_device.h
index 4ef06b38cf868e7279da975065e91fddb904785f..9fd64e56f135a7d981a913a220e77ae6a0b9f749 100644
--- a/ui/events/devices/input_device.h
+++ b/ui/events/devices/input_device.h
@@ -45,6 +45,9 @@ struct EVENTS_DEVICES_EXPORT InputDevice {
   // Name of the device.
   std::string name;
 
+  // If the device is enabled, and whether events should be dispatched to UI.
+  bool enabled = false;
+

[sadrul, 2017/05/17 15:32:17]

Can you please also update InputDevice mojom in
ui/events/devices/mojo/input_devices.mojom (and the corresponding
struct-traits)? You can do that in a follow up CL if you want.

   // The path to the input device in the sysfs filesystem.
   base::FilePath sys_path;