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diff --git a/app/tree_model.h b/app/tree_model.h
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+++ b/app/tree_model.h
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+// Copyright (c) 2008 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 APP_TREE_MODEL_H_
+#define APP_TREE_MODEL_H_
+
+#include <string>
+
+#include "base/logging.h"
+
+class SkBitmap;
+
+class TreeModel;
+
+// TreeModelNode --------------------------------------------------------------
+
+// Type of class returned from the model.
+class TreeModelNode {
+ public:
+  // Returns the title for the node.
+  virtual std::wstring GetTitle() = 0;
+};
+
+// Observer for the TreeModel. Notified of significant events to the model.
+class TreeModelObserver {
+ public:
+  // Notification that nodes were added to the specified parent.
+  virtual void TreeNodesAdded(TreeModel* model,
+                              TreeModelNode* parent,
+                              int start,
+                              int count) = 0;
+
+  // Notification that nodes were removed from the specified parent.
+  virtual void TreeNodesRemoved(TreeModel* model,
+                                TreeModelNode* parent,
+                                int start,
+                                int count) = 0;
+
+  // Notification the children of |parent| have been reordered. Note, only
+  // the direct children of |parent| have been reordered, not descendants.
+  virtual void TreeNodeChildrenReordered(TreeModel* model,
+                                         TreeModelNode* parent) = 0;
+
+  // Notification that the contents of a node has changed.
+  virtual void TreeNodeChanged(TreeModel* model, TreeModelNode* node) = 0;
+};
+
+// TreeModel ------------------------------------------------------------------
+
+// The model for TreeView.
+class TreeModel {
+ public:
+  // Returns the root of the tree. This may or may not be shown in the tree,
+  // see SetRootShown for details.
+  virtual TreeModelNode* GetRoot() = 0;
+
+  // Returns the number of children in the specified node.
+  virtual int GetChildCount(TreeModelNode* parent) = 0;
+
+  // Returns the child node at the specified index.
+  virtual TreeModelNode* GetChild(TreeModelNode* parent, int index) = 0;
+
+  // Returns the parent of a node, or NULL if node is the root.
+  virtual TreeModelNode* GetParent(TreeModelNode* node) = 0;
+
+  // Sets the observer of the model.
+  virtual void SetObserver(TreeModelObserver* observer) = 0;
+
+  // Sets the title of the specified node.
+  // This is only invoked if the node is editable and the user edits a node.
+  virtual void SetTitle(TreeModelNode* node,
+                        const std::wstring& title) {
+    NOTREACHED();
+  }
+
+  // Returns the set of icons for the nodes in the tree. You only need override
+  // this if you don't want to use the default folder icons.
+  virtual void GetIcons(std::vector<SkBitmap>* icons) {}
+
+  // Returns the index of the icon to use for |node|. Return -1 to use the
+  // default icon. The index is relative to the list of icons returned from
+  // GetIcons.
+  virtual int GetIconIndex(TreeModelNode* node) { return -1; }
+};
+
+#endif  // APP_TREE_TREE_MODEL_H_