Makes the view manager notify the client of new roots correctly

mojo/services/view_manager/view_manager_connection.cc

Index: mojo/services/view_manager/view_manager_connection.cc
diff --git a/mojo/services/view_manager/view_manager_connection.cc b/mojo/services/view_manager/view_manager_connection.cc
index 8d4d0a6438ec31f1a7336fed2ddfdb1d7ab66464..104baf9fc4bff12d2ecc4491648dc47280fa8cd0 100644
--- a/mojo/services/view_manager/view_manager_connection.cc
+++ b/mojo/services/view_manager/view_manager_connection.cc
@@ -389,10 +389,14 @@ bool ViewManagerConnection::AddRoots(
 
     did_add_root = true;
     roots_.insert(node_ids[i]);
+    Node* node = GetNode(NodeIdFromTransportId(node_ids[i]));
+    DCHECK(node);
     if (known_nodes_.count(node_ids[i]) == 0) {
-      Node* node = GetNode(NodeIdFromTransportId(node_ids[i]));
-      DCHECK(node);
       GetUnknownNodesFrom(node, &to_send);
+    } else {
+      // Even though the connection knows about the new root we need to tell it
+      // |node| is now a root.
+      to_send.push_back(node);
     }
   }