Disabled xinput2 until edge cases can be fixed.

ui/events/devices/x11/device_data_manager_x11.cc

Index: ui/events/devices/x11/device_data_manager_x11.cc
diff --git a/ui/events/devices/x11/device_data_manager_x11.cc b/ui/events/devices/x11/device_data_manager_x11.cc
index 0d9d04c9170a89568f1afa5fad64e646476ef954..09cfd405c10addf75cc58fd3647bddd0d159f19f 100644
--- a/ui/events/devices/x11/device_data_manager_x11.cc
+++ b/ui/events/devices/x11/device_data_manager_x11.cc
@@ -771,6 +771,12 @@ void DeviceDataManagerX11::UpdateScrollClassDevice(
   DCHECK(deviceid >= 0 && deviceid < kMaxDeviceNum);
   ScrollInfo& info = scroll_data_[deviceid];
 
+  // xinput2 is disabled until edge cases are fixed.
+  bool xinput2_disabled = true;
+  if (xinput2_disabled) {

[bokan, 2016/06/29 18:34:24]

No need for the variable and if statement. Just return. Make the comment a TODO
and add a link to crbug.com/616308

+    return;
+  }
+
   bool legacy_scroll_available =
       (scroll_class_info->flags & XIScrollFlagNoEmulation) == 0;
   // If the device's highest resolution is lower than the resolution of xinput1