Makes the view manager notify the client of new roots correctly

mojo/services/view_manager/view_manager_connection.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/services/view_manager/view_manager_connection.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "mojo/services/public/cpp/geometry/geometry_type_converters.h"
 #include "mojo/services/public/cpp/input_events/input_events_type_converters.h"
@@ skipping 371 matching lines @@
     const std::vector<Id>& node_ids) {
   std::vector<const Node*> to_send;
   bool did_add_root = false;
   for (size_t i = 0; i < node_ids.size(); ++i) {
     CHECK_EQ(creator_id_, NodeIdFromTransportId(node_ids[i]).connection_id);
     if (roots_.count(node_ids[i]) > 0)
       continue;
 
     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);
     }
   }
 
   if (!did_add_root)
     return false;
 
   client()->OnRootsAdded(NodesToINodes(to_send));
   return true;
 }
 
@@ skipping 292 matching lines @@
   client()->OnViewManagerConnectionEstablished(
       id_,
       creator_url_,
       root_node_manager_->next_server_change_id(),
       NodesToINodes(to_send));
 }
 
 }  // namespace service
 }  // namespace view_manager
 }  // namespace mojo