mus: Server-side implementation of modal windows

components/mus/ws/connection_manager.cc

Index: components/mus/ws/connection_manager.cc
diff --git a/components/mus/ws/connection_manager.cc b/components/mus/ws/connection_manager.cc
index a710d9fa1b7424d326ebc61ebcc5241e07585679..1b7cb7dc5765053f02c723e33da58ca6151aebd6 100644
--- a/components/mus/ws/connection_manager.cc
+++ b/components/mus/ws/connection_manager.cc
@@ -527,6 +527,12 @@ void ConnectionManager::OnWillChangeWindowVisibility(ServerWindow* window) {
   }
 }
 
+void ConnectionManager::OnWindowVisibilityChanged(ServerWindow* window) {
+  Display* display = display_manager_->GetDisplayContaining(window);
+  if (display)
+    display->ReleaseCaptureForModalWindow(window);
+}
+
 void ConnectionManager::OnWindowPredefinedCursorChanged(ServerWindow* window,
                                                         int32_t cursor_id) {
   if (in_destructor_)