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diff --git a/ash/shell_delegate.h b/ash/shell_delegate.h
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+++ b/ash/shell_delegate.h
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+// Copyright (c) 2011 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 ASH_SHELL_DELEGATE_H_
+#define ASH_SHELL_DELEGATE_H_
+#pragma once
+
+#include "base/callback.h"
+#include "ash/ash_export.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace views {
+class Widget;
+}
+
+namespace aura_shell {
+
+class AppListModel;
+class AppListViewDelegate;
+struct LauncherItem;
+
+// Delegate of the Shell.
+class ASH_EXPORT ShellDelegate {
+ public:
+  // Callback to pass back a widget used by RequestAppListWidget.
+  typedef base::Callback<void(views::Widget*)> SetWidgetCallback;
+
+  // The Shell owns the delegate.
+  virtual ~ShellDelegate() {}
+
+  // Invoked when the user clicks on button in the launcher to create a new
+  // window.
+  virtual void CreateNewWindow() = 0;
+
+  // Invoked to create a new status area. Can return NULL.
+  virtual views::Widget* CreateStatusArea() = 0;
+
+  // Invoked to create app list widget. The Delegate calls the callback
+  // when the widget is ready to show.
+  // Deprecated.
+  // TODO(xiyuan): Clean this up when switching to views app list.
+  virtual void RequestAppListWidget(
+      const gfx::Rect& bounds,
+      const SetWidgetCallback& callback) = 0;
+
+  // Invoked to ask the delegate to populate the |model|.
+  virtual void BuildAppListModel(AppListModel* model) = 0;
+
+  // Invoked to create an AppListViewDelegate. Shell takes the ownership of
+  // the created delegate.
+  virtual AppListViewDelegate* CreateAppListViewDelegate() = 0;
+
+  // Invoked when the user clicks on a window entry in the launcher.
+  virtual void LauncherItemClicked(const LauncherItem& item) = 0;
+
+  // Invoked when a window is added. If the delegate wants the launcher to show
+  // an entry for |item->window| it should configure |item| appropriately and
+  // return true.
+  virtual bool ConfigureLauncherItem(LauncherItem* item) = 0;
+};
+}  // namespace aura_shell
+
+#endif  // ASH_SHELL_DELEGATE_H_