Add support for mapping node tree on the client.

mojo/services/public/cpp/view_manager/lib/view_tree_node.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/public/cpp/view_manager/view_tree_node.h"
 
 #include "mojo/services/public/cpp/view_manager/lib/view_manager_private.h"
 #include "mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h"
 #include "mojo/services/public/cpp/view_manager/lib/view_tree_node_private.h"
 #include "mojo/services/public/cpp/view_manager/view_tree_node_observer.h"
@@ skipping 100 matching lines @@
       DCHECK(std::find(children_.begin(), children_.end(), child) ==
              children_.end());
     } else {
       RemoveChild(child);
     }
   }
 
   if (parent_)
     parent_->RemoveChild(this);
 
+  if (manager_)
+    ViewManagerPrivate(manager_).synchronizer()->DestroyViewTreeNode(id_);
 }
 
 void ViewTreeNode::AddObserver(ViewTreeNodeObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void ViewTreeNode::RemoveObserver(ViewTreeNodeObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void ViewTreeNode::AddChild(ViewTreeNode* child) {
-  ScopedTreeNotifier notifier(child, child->parent(), this);
-  if (child->parent())
-    RemoveChildImpl(child, &child->parent_->children_);
-  children_.push_back(child);
-  child->parent_ = this;
-  ViewManagerPrivate(manager_).synchronizer()->AddChild(child->id(), id_);
+  LocalAddChild(child);
+  if (manager_)
+    ViewManagerPrivate(manager_).synchronizer()->AddChild(child->id(), id_);
 }
 
 void ViewTreeNode::RemoveChild(ViewTreeNode* child) {
-  DCHECK_EQ(this, child->parent());
-  ScopedTreeNotifier(child, this, NULL);
-  RemoveChildImpl(child, &children_);
-  ViewManagerPrivate(manager_).synchronizer()->RemoveChild(child->id(), id_);
+  LocalRemoveChild(child);
+  if (manager_)
+    ViewManagerPrivate(manager_).synchronizer()->RemoveChild(child->id(), id_);
 }
 
 bool ViewTreeNode::Contains(ViewTreeNode* child) const {
   for (ViewTreeNode* p = child->parent(); p; p = p->parent()) {
     if (p == this)
       return true;
   }
   return false;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// ViewTreeNode, private:
+
+void ViewTreeNode::LocalAddChild(ViewTreeNode* child) {
+  ScopedTreeNotifier notifier(child, child->parent(), this);
+  if (child->parent())
+    RemoveChildImpl(child, &child->parent_->children_);
+  children_.push_back(child);
+  child->parent_ = this;
+}
+
+void ViewTreeNode::LocalRemoveChild(ViewTreeNode* child) {
+  DCHECK_EQ(this, child->parent());
+  ScopedTreeNotifier(child, this, NULL);
+  RemoveChildImpl(child, &children_);
+}
+
 }  // namespace view_manager
 }  // namespace services
 }  // namespace mojo