Make browser windows override_redirect when dragging tabs.

ui/aura/window_tree_host_x11.cc

Index: ui/aura/window_tree_host_x11.cc
diff --git a/ui/aura/window_tree_host_x11.cc b/ui/aura/window_tree_host_x11.cc
index 084296c34086b8ab8e2c9a20912036b04dedf0be..2653c1e099df43607bd1b343aef50a486082dad3 100644
--- a/ui/aura/window_tree_host_x11.cc
+++ b/ui/aura/window_tree_host_x11.cc
@@ -551,6 +551,9 @@ void WindowTreeHostX11::SetCapture() {
 void WindowTreeHostX11::ReleaseCapture() {
 }
 
+void WindowTreeHostX11::RemapAsNormalWindow() {

[Daniel Erat, 2016/01/19 20:36:22]

NOTREACHED() here too?

[stapelberg, 2016/01/20 13:31:09]

Done.

+}
+
 void WindowTreeHostX11::SetCursorNative(gfx::NativeCursor cursor) {
   if (cursor == current_cursor_)
     return;