Add display task to trigger display configuration

ui/display/chromeos/x11/native_display_delegate_x11.cc

Index: ui/display/chromeos/x11/native_display_delegate_x11.cc
diff --git a/ui/display/chromeos/x11/native_display_delegate_x11.cc b/ui/display/chromeos/x11/native_display_delegate_x11.cc
index 525fcc96a5f5353eb57bb3b74bc88670d047db33..fd0402cd4fffcc6c9938292d8e2352850bf1d6c7 100644
--- a/ui/display/chromeos/x11/native_display_delegate_x11.cc
+++ b/ui/display/chromeos/x11/native_display_delegate_x11.cc
@@ -192,6 +192,11 @@ std::vector<DisplaySnapshot*> NativeDisplayDelegateX11::GetDisplays() {
   return cached_outputs_.get();
 }
 
+void NativeDisplayDelegateX11::GetDisplays(
+    const GetDisplaysCallback& callback) {
+  callback.Run(GetDisplays());
+}
+
 void NativeDisplayDelegateX11::AddMode(const DisplaySnapshot& output,
                                        const DisplayMode* mode) {
   CHECK(screen_) << "Server not grabbed";