Make PointerDeviceObserver work under Ozone

ui/events/platform/x11/x11_hotplug_event_handler.cc

Index: ui/events/platform/x11/x11_hotplug_event_handler.cc
diff --git a/ui/events/platform/x11/x11_hotplug_event_handler.cc b/ui/events/platform/x11/x11_hotplug_event_handler.cc
index 78ecf3554608f37a5385f6491f3bad718b3912a7..4e546f9ebd43405892a0d3b871422dfc081f9bbd 100644
--- a/ui/events/platform/x11/x11_hotplug_event_handler.cc
+++ b/ui/events/platform/x11/x11_hotplug_event_handler.cc
@@ -340,6 +340,8 @@ void X11HotplugEventHandler::OnHotplugEvent() {
   UiCallbacks callbacks;
   callbacks.keyboard_callback = base::Bind(&OnKeyboardDevices);
   callbacks.touchscreen_callback = base::Bind(&OnTouchscreenDevices);
+  // TODO(pkotwicz): Requery the lists of mice and touchpads and send the new
+  // lists to DeviceHotplugEventObserver.

[sadrul, 2015/02/03 15:29:04]

Would we need to requery the list here? Presumably the list we get
(|device_list|) would include mouse and touchpad devices?

[sadrul, 2015/02/03 17:33:04]

ping

[pkotwicz, 2015/02/03 18:09:33]

I have updated the comment so that it is clearer.

 
   // Parsing the device information may block, so delegate the operation to a
   // worker thread. Once the device information is extracted the parsed devices