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

services/ui/ws/window_tree.cc

Index: services/ui/ws/window_tree.cc
diff --git a/services/ui/ws/window_tree.cc b/services/ui/ws/window_tree.cc
index 7b677590017f2841d671284be29e16e733644c25..8de070ecf32365f10db5bba599d794c118d465d6 100644
--- a/services/ui/ws/window_tree.cc
+++ b/services/ui/ws/window_tree.cc
@@ -347,6 +347,13 @@ bool WindowTree::SetFocus(const ClientWindowId& window_id) {
   return success;
 }
 
+void WindowTree::SetAcceptEvents(Id transport_window_id, bool accept_events) {
+  ServerWindow* window =
+      GetWindowByClientId(ClientWindowId(transport_window_id));
+  if (window && access_policy_->CanSetAcceptEvents(window))
+    window->set_accept_events(accept_events);
+}
+
 bool WindowTree::Embed(const ClientWindowId& window_id,
                        mojom::WindowTreeClientPtr client,
                        uint32_t flags) {