Wires up immersive mode for chrome and mash

services/ui/ws/window_finder.cc

Index: services/ui/ws/window_finder.cc
diff --git a/services/ui/ws/window_finder.cc b/services/ui/ws/window_finder.cc
index 0b46df6a0acbc3763aa4e0ba04e091e96f62993a..cc3739c444c59da3a0a1c1757319229459f20408 100644
--- a/services/ui/ws/window_finder.cc
+++ b/services/ui/ws/window_finder.cc
@@ -20,8 +20,12 @@ namespace ws {
 
 bool IsValidWindowForEvents(ServerWindow* window) {
   ServerWindowSurfaceManager* surface_manager = window->surface_manager();
+  // Valid windows have at least one of the two surface types. Only an underlay
+  // is valid as we assume the window manager will likely get the event in this
+  // case.
   return surface_manager &&
-         surface_manager->HasSurfaceOfType(mojom::SurfaceType::DEFAULT);
+         (surface_manager->HasSurfaceOfType(mojom::SurfaceType::DEFAULT) ||
+          surface_manager->HasSurfaceOfType(mojom::SurfaceType::UNDERLAY));
 }
 
 ServerWindow* FindDeepestVisibleWindowForEvents(ServerWindow* window,