exo: Send damage to compositor when committing new buffer.

components/exo/wayland/clients/motion_events.cc

Index: components/exo/wayland/clients/motion_events.cc
diff --git a/components/exo/wayland/clients/motion_events.cc b/components/exo/wayland/clients/motion_events.cc
index 37cdb045c911222a61f9266798afaf1a5b4d444c..9f7f86e7088a1ba1fa6f09b67e751dec299fff71 100644
--- a/components/exo/wayland/clients/motion_events.cc
+++ b/components/exo/wayland/clients/motion_events.cc
@@ -673,6 +673,7 @@ int MotionEvents::Run() {
     if (!frame.callback_pending) {
       DCHECK_GT(pending_frames.size(), 0u);
       wl_surface_set_buffer_scale(surface.get(), scale_);
+      wl_surface_damage(surface.get(), 0, 0, width_ / scale_, height_ / scale_);
       wl_surface_attach(surface.get(), pending_frames.front(), 0, 0);
       pending_frames.pop_front();