make menus, bubbles, etc. top level windows on aura

ui/views/widget/desktop_aura/desktop_root_window_host_linux.cc

Index: ui/views/widget/desktop_aura/desktop_root_window_host_linux.cc
diff --git a/ui/views/widget/desktop_aura/desktop_root_window_host_linux.cc b/ui/views/widget/desktop_aura/desktop_root_window_host_linux.cc
index a402d72c08c2df83cd9ef70805a6baefac0f2e15..bac4b67ef34162fae1606c7b3e944e799abd6c52 100644
--- a/ui/views/widget/desktop_aura/desktop_root_window_host_linux.cc
+++ b/ui/views/widget/desktop_aura/desktop_root_window_host_linux.cc
@@ -329,6 +329,10 @@ aura::RootWindow* DesktopRootWindowHostLinux::Init(
   return InitRootWindow(sanitized_params);
 }
 
+void DesktopRootWindowHostLinux::InitFocus(aura::Window* window) {
+  focus_client_->FocusWindow(window);
+}
+
 void DesktopRootWindowHostLinux::Close() {
   // TODO(erg): Might need to do additional hiding tasks here.