Add support for mapping node tree on the client.

mojo/services/public/cpp/view_manager/lib/view_tree_node_private.h

 // 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.
 
 #ifndef MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_TREE_NODE_PRIVATE_H_
 #define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_TREE_NODE_PRIVATE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 
 #include "mojo/services/public/cpp/view_manager/view_tree_node.h"
 
 namespace mojo {
 namespace services {
 namespace view_manager {
 
 class ViewTreeNodePrivate {
  public:
   explicit ViewTreeNodePrivate(ViewTreeNode* node);
   ~ViewTreeNodePrivate();
 
   ObserverList<ViewTreeNodeObserver>* observers() { return &node_->observers_; }
 
   void ClearParent() { node_->parent_ = NULL; }
 
+  void set_id(TransportNodeId id) { node_->id_ = id; }
+
+  void set_view_manager(ViewManager* manager) {
+    node_->manager_ = manager;
+  }
+
+  void LocalAddChild(ViewTreeNode* child) {
+    node_->LocalAddChild(child);
+  }
+
  private:
   ViewTreeNode* node_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewTreeNodePrivate);
 };
 
 }  // namespace view_manager
 }  // namespace services
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_TREE_NODE_PRIVATE_H_