mus Window Server: implement event capture

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 d40f4283c3d2fc34e3a9eb3d46e02e5bc77c9875..b98fd6bc05d6ca704e75da534f8ff68a14effeff 100644
--- a/components/mus/ws/connection_manager.cc
+++ b/components/mus/ws/connection_manager.cc
@@ -344,6 +344,13 @@ void ConnectionManager::ProcessClientAreaChanged(
   }
 }
 
+void ConnectionManager::ProcessLostCapture(const ServerWindow* window) {
+  for (auto& pair : connection_map_) {
+    pair.second->service()->ProcessLostCapture(window,
+                                               IsOperationSource(pair.first));
+  }
+}
+
 void ConnectionManager::ProcessWillChangeWindowHierarchy(
     const ServerWindow* window,
     const ServerWindow* new_parent,