Ignore EnterNotify and ExitNotify events from NativeViewGlSurfaceGLX's window.

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 f5465bfae82b59ee9726b3143246ded949a02817..f507233482ce59e56c95cb4087ff36a787630934 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
@@ -1530,6 +1530,13 @@ uint32_t DesktopWindowTreeHostX11::DispatchEvent(
   switch (xev->type) {
     case EnterNotify:
     case LeaveNotify: {
+      // Ignore EventNotify and LeaveNotify events from children of |xwindow_|.
+      // NativeViewGLSurfaceGLX adds a child to |xwindow_|.
+      // TODO(pkotwicz|tdanderson): Figure out whether the suppression is
+      // necessary. crbug.com/385716
+      if (xev->xcrossing.detail == NotifyInferior)
+        break;
+
       ui::MouseEvent mouse_event(xev);
       DispatchMouseEvent(&mouse_event);
       break;