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diff --git a/ui/views/widget/window_manager.h b/ui/views/widget/window_manager.h
new file mode 100644
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+++ b/ui/views/widget/window_manager.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 UI_VIEWS_WIDGET_WINDOW_MANAGER_H_
+#define UI_VIEWS_WIDGET_WINDOW_MANAGER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "ui/base/events.h"
+#include "views/views_export.h"
+
+namespace gfx {
+class Point;
+}
+
+namespace views {
+class KeyEvent;
+class MouseEvent;
+class TouchEvent;
+class Widget;
+
+// A interface to WindowManager.
+class VIEWS_EXPORT WindowManager {
+ public:
+  WindowManager();
+  virtual ~WindowManager();
+
+  // Starts moving window given by |widget|. |point| represents the
+  // initial location of the mouse pointer.
+  virtual void StartMoveDrag(Widget* widget, const gfx::Point& point) = 0;
+
+  // Starts resizing window give by |widget|. |point| represents the
+  // initial location of the mouse pointer and |hittest_code| represents
+  // the edge of the window a user selected to resize the window. See
+  // ui/base/hit_test.h for the hittest_code definition.
+  virtual void StartResizeDrag(
+      Widget* widget, const gfx::Point& point, int hittest_code) = 0;
+
+  // Sets mouse capture on |widget|. Returns false if other widget
+  // already has mouse capture.
+  virtual bool SetMouseCapture(Widget* widget) = 0;
+
+  // Releases the mouse capture on |widget|. Returns false if |widget|
+  // haven't capture the mouse.
+  virtual bool ReleaseMouseCapture(Widget* widget) = 0;
+
+  // Checks if the |widget| has mouse capture.
+  virtual bool HasMouseCapture(const Widget* widget) const = 0;
+
+  // WindowManager handles mouse event first. It may reisze/move window,
+  // or send the event to widget that has mouse capture.
+  virtual bool HandleKeyEvent(Widget* widget, const KeyEvent& event) = 0;
+
+  // WindowManager handles mouse event first. It may resize/move window,
+  // or send the event to widget that has mouse capture.
+  virtual bool HandleMouseEvent(Widget* widget, const MouseEvent& event) = 0;
+
+  // WindowManager handles touch event first. It is currently used only to
+  // activate windows. But it can also be used to move/resize windows.
+  virtual ui::TouchStatus HandleTouchEvent(Widget* widget,
+                                           const TouchEvent& event) = 0;
+
+  // Register widget to the window manager.
+  virtual void Register(Widget* widget) = 0;
+
+  // Installs window manager.
+  static void Install(WindowManager* wm);
+
+  // Returns installed WindowManager.
+  static WindowManager* Get();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WindowManager);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_WINDOW_MANAGER_H_