Change ui::Event::time_stamp from TimeDelta to TimeTicks

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index f792797e855ba9bce9df44581b395eb5a55fe9ea..bb8ba99593f489b8c2d8e061657c4c4c4f392fc8 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -1442,7 +1442,7 @@ void DesktopWindowTreeHostX11::UpdateWMUserTime(
       type == ui::ET_KEY_PRESSED ||
       type == ui::ET_TOUCH_PRESSED) {
     unsigned long wm_user_time_ms = static_cast<unsigned long>(
-        ui::EventTimeFromNative(event).InMilliseconds());
+        (ui::EventTimeFromNative(event) - base::TimeTicks()).InMilliseconds());
     XChangeProperty(xdisplay_,
                     xwindow_,
                     atom_cache_.GetAtom("_NET_WM_USER_TIME"),