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

services/ui/public/cpp/window_tree_client.h

Index: services/ui/public/cpp/window_tree_client.h
diff --git a/services/ui/public/cpp/window_tree_client.h b/services/ui/public/cpp/window_tree_client.h
index 898178c5ffd80fc32a818551577a4aaaa544b66d..08a5e10d717c2bcffba7ce90c7defd93adbebed3 100644
--- a/services/ui/public/cpp/window_tree_client.h
+++ b/services/ui/public/cpp/window_tree_client.h
@@ -112,6 +112,7 @@ class WindowTreeClient : public mojom::WindowTreeClient,
   void ClearHitTestMask(Id window_id);
   void SetFocus(Window* window);
   void SetCanFocus(Id window_id, bool can_focus);
+  void SetCanAcceptEvents(Id window_id, bool can_accept_events);
   void SetPredefinedCursor(Id window_id, ui::mojom::Cursor cursor_id);
   void SetVisible(Window* window, bool visible);
   void SetOpacity(Window* window, float opacity);