Implemented smooth scrolling using xinput2 in X11.

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 a6f120943f57de515556c227b84f04f8f253b208..a50b12ee953293c79ab176e023d7bf0df18ddb1e 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
@@ -1662,6 +1662,9 @@ uint32_t DesktopWindowTreeHostX11::DispatchEvent(
       if (xev->xcrossing.detail == NotifyInferior)
         break;
 
+      // Clear stored scroll data
+      ui::DeviceDataManagerX11::GetInstance()->InvalidateScrollClasses();
+
       ui::MouseEvent mouse_event(xev);
       DispatchMouseEvent(&mouse_event);
       break;