[exp] ash: Ash in Mus.

components/mus/ws/window_finder.cc

Index: components/mus/ws/window_finder.cc
diff --git a/components/mus/ws/window_finder.cc b/components/mus/ws/window_finder.cc
index 592d7538d330c71705ce4306769ecc00f7abd544..76de747f6eb2f692e54dd514c62ba01450186c78 100644
--- a/components/mus/ws/window_finder.cc
+++ b/components/mus/ws/window_finder.cc
@@ -84,7 +84,7 @@ ServerWindow* FindDeepestVisibleWindowForEvents(
     cc::SurfaceId display_surface_id,
     gfx::Point* location) {
   // TODO(sky): remove this when insets can be set on surface.
-  display_surface_id = cc::SurfaceId();
+  // display_surface_id = cc::SurfaceId();
 
   if (display_surface_id.is_null()) {
     // Surface-based hit-testing will not return a valid target if no
@@ -106,7 +106,8 @@ ServerWindow* FindDeepestVisibleWindowForEvents(
   ServerWindow* target = root_window->GetChildWindow(id);
   if (target)
     transform.TransformPoint(location);
-  return target;
+  return target ? target
+                : FindDeepestVisibleWindowNonSurface(root_window, location);
 }
 
 gfx::Transform GetTransformToWindow(cc::SurfaceId display_surface_id,