Makes Embed() take a single node

mojo/services/view_manager/test_change_tracker.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/test_change_tracker.h"
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/services/public/cpp/geometry/geometry_type_converters.h"
@@ skipping 19 matching lines @@
   return direction == ORDER_ABOVE ? "above" : "below";
 }
 
 std::string ChangeToDescription1(const Change& change) {
   switch (change.type) {
     case CHANGE_TYPE_CONNECTION_ESTABLISHED:
       return base::StringPrintf("OnConnectionEstablished creator=%s",
                                 change.creator_url.data());
 
     case CHANGE_TYPE_ROOTS_ADDED:
-      return "OnRootsAdded";
+      return "OnRootAdded";
 
     case CHANGE_TYPE_SERVER_CHANGE_ID_ADVANCED:
       return base::StringPrintf(
           "ServerChangeIdAdvanced %d", static_cast<int>(change.change_id));
 
 
     case CHANGE_TYPE_NODE_BOUNDS_CHANGED:
       return base::StringPrintf(
           "BoundsChanged node=%s old_bounds=%s new_bounds=%s",
           NodeIdToString(change.node_id).c_str(),
@@ skipping 100 matching lines @@
     Array<NodeDataPtr> nodes) {
   Change change;
   change.type = CHANGE_TYPE_CONNECTION_ESTABLISHED;
   change.connection_id = connection_id;
   change.change_id = next_server_change_id;
   change.creator_url = creator_url;
   NodeDatasToTestNodes(nodes, &change.nodes);
   AddChange(change);
 }
 
-void TestChangeTracker::OnRootsAdded(Array<NodeDataPtr> nodes) {
+void TestChangeTracker::OnRootAdded(Array<NodeDataPtr> nodes) {
   Change change;
   change.type = CHANGE_TYPE_ROOTS_ADDED;
   NodeDatasToTestNodes(nodes, &change.nodes);
   AddChange(change);
 }
 
 void TestChangeTracker::OnServerChangeIdAdvanced(Id change_id) {
   Change change;
   change.type = CHANGE_TYPE_SERVER_CHANGE_ID_ADVANCED;
   change.change_id = change_id;
@@ skipping 82 matching lines @@
 std::string TestNode::ToString() const {
   return base::StringPrintf("node=%s parent=%s view=%s",
                             NodeIdToString(node_id).c_str(),
                             NodeIdToString(parent_id).c_str(),
                             NodeIdToString(view_id).c_str());
 }
 
 }  // namespace service
 }  // namespace view_manager
 }  // namespace mojo