mus: Disregard windows that explicitly set can_accept_events to be false when sending events.

services/ui/ws/window_tree.h

Index: services/ui/ws/window_tree.h
diff --git a/services/ui/ws/window_tree.h b/services/ui/ws/window_tree.h
index 6555ff338d78c45b8b5c69b8bf89338b6f8360e0..ff71bda9353ed8db5d10e749f9c1e815f6484f06 100644
--- a/services/ui/ws/window_tree.h
+++ b/services/ui/ws/window_tree.h
@@ -394,6 +394,8 @@ class WindowTree : public mojom::WindowTree,
              const EmbedCallback& callback) override;
   void SetFocus(uint32_t change_id, Id transport_window_id) override;
   void SetCanFocus(Id transport_window_id, bool can_focus) override;
+  void SetCanAcceptEvents(Id transport_window_id,
+                          bool can_accept_events) override;
   void SetPredefinedCursor(uint32_t change_id,
                            Id transport_window_id,
                            ui::mojom::Cursor cursor_id) override;