Fix window/display bounds with multiple windows in mus.

services/ui/ws/platform_display_init_params.h

Index: services/ui/ws/platform_display_init_params.h
diff --git a/services/ui/ws/platform_display_init_params.h b/services/ui/ws/platform_display_init_params.h
index 99bda3f51db0584bacc779e24ffe344c7935ccea..a43606e9f974f41462f77350a4b768062995cb89 100644
--- a/services/ui/ws/platform_display_init_params.h
+++ b/services/ui/ws/platform_display_init_params.h
@@ -10,6 +10,10 @@
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/geometry/rect.h"
 
+namespace display{
+class PlatformScreen;
+}
+
 namespace shell {
 class Connector;
 }
@@ -30,6 +34,7 @@ struct PlatformDisplayInitParams {
 
   gfx::Rect display_bounds;
   int64_t display_id;
+  display::PlatformScreen* platform_screen = nullptr;
 };
 
 }  // namespace ws