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diff --git a/views/widget/widget.h b/views/widget/widget.h
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+++ b/views/widget/widget.h
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+// Copyright (c) 2006-2008 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 VIEWS_WIDGET_WIDGET_H_
+#define VIEWS_WIDGET_WIDGET_H_
+
+#include "base/gfx/native_widget_types.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace views {
+
+class Accelerator;
+class RootView;
+class TooltipManager;
+class Window;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Widget interface
+//
+//   Widget is an abstract class that defines the API that should be implemented
+//   by a native window in order to host a view hierarchy.
+//
+//   Widget wraps a hierarchy of View objects (see view.h) that implement
+//   painting and flexible layout within the bounds of the Widget's window.
+//
+//   The Widget is responsible for handling various system events and forwarding
+//   them to the appropriate view.
+//
+/////////////////////////////////////////////////////////////////////////////
+
+class Widget {
+ public:
+  virtual ~Widget() { }
+
+  // Returns the bounds of this Widget in the screen coordinate system.
+  // If the receiving Widget is a frame which is larger than its client area,
+  // this method returns the client area if including_frame is false and the
+  // frame bounds otherwise. If the receiving Widget is not a frame,
+  // including_frame is ignored.
+  virtual void GetBounds(gfx::Rect* out, bool including_frame) const = 0;
+
+  // Returns the gfx::NativeView associated with this Widget.
+  virtual gfx::NativeView GetNativeView() const = 0;
+
+  // Forces a paint of a specified rectangle immediately.
+  virtual void PaintNow(const gfx::Rect& update_rect) = 0;
+
+  // Returns the RootView contained by this Widget.
+  virtual RootView* GetRootView() = 0;
+
+  // Returns whether the Widget is visible to the user.
+  virtual bool IsVisible() const = 0;
+
+  // Returns whether the Widget is the currently active window.
+  virtual bool IsActive() const = 0;
+
+  // Returns the TooltipManager for this Widget. If this Widget does not support
+  // tooltips, NULL is returned.
+  virtual TooltipManager* GetTooltipManager() {
+    return NULL;
+  }
+
+  // Returns the accelerator given a command id. Returns false if there is
+  // no accelerator associated with a given id, which is a common condition.
+  virtual bool GetAccelerator(int cmd_id,
+                              Accelerator* accelerator) = 0;
+
+  // Returns the Window containing this Widget, or NULL if not contained in a
+  // window.
+  virtual Window* GetWindow() { return NULL; }
+  virtual const Window* GetWindow() const { return NULL; }
+};
+
+}  // namespace views
+
+#endif // VIEWS_WIDGET_WIDGET_H_