Make the Mouse integration work in Virtualbox

ui/events/devices/x11/touch_factory_x11.cc

Index: ui/events/devices/x11/touch_factory_x11.cc
diff --git a/ui/events/devices/x11/touch_factory_x11.cc b/ui/events/devices/x11/touch_factory_x11.cc
index dc26db5cd0b61f62d265084272895686b1402d87..53aa4b12a3dbd9d644f84200b08ac24d1d76db5d 100644
--- a/ui/events/devices/x11/touch_factory_x11.cc
+++ b/ui/events/devices/x11/touch_factory_x11.cc
@@ -83,22 +83,9 @@ void TouchFactory::UpdateDeviceList(Display* display) {
   touch_device_list_.clear();
   touchscreen_ids_.clear();
 
-  // NOTE: The new API for retrieving the list of devices (XIQueryDevice) does
-  // not provide enough information to detect a touch device. As a result, the
-  // old version of query function (XListInputDevices) is used instead.
-  // If XInput2 is not supported, this will return null (with count of -1) so
-  // we assume there cannot be any touch devices.
+  // NOTE: If XInput2 is not supported, this will return null (with count of
+  // -1) so we assume there cannot be any touch devices.
   // With XI2.1 or older, we allow only single touch devices.

[sadrul, 2015/03/30 21:19:00]

Not sure what you mean by 'this will return null'. Do you mean this function, or
the call to GetXIDeviceList(), or the call to GetXDeviceList()?

I think you can just remove this entire comment.

[lanwei, 2015/03/30 21:36:28]

I mean the two lists, touch_device_lookup_, touch_device_list_, because they are
not setup. Never mind, the comments seem unnecessary, I removed it.

Done.

-  const XDeviceList& dev_list =
-      DeviceListCacheX11::GetInstance()->GetXDeviceList(display);
-  Atom xi_touchscreen = XInternAtom(display, XI_TOUCHSCREEN, false);
-  for (int i = 0; i < dev_list.count; i++) {
-    if (dev_list[i].type == xi_touchscreen) {
-      touch_device_lookup_[dev_list[i].id] = true;
-      touch_device_list_[dev_list[i].id] = false;
-    }
-  }
-
   if (!DeviceDataManagerX11::GetInstance()->IsXInput2Available())
     return;