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diff --git a/ash/wm/window_positioner.h b/ash/wm/window_positioner.h
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+// Copyright 2013 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_WM_WINDOW_POSITIONER_H_
+#define ASH_WM_WINDOW_POSITIONER_H_
+
+#include "ash/ash_export.h"
+#include "base/basictypes.h"
+#include "ui/gfx/rect.h"
+
+namespace aura {
+class Window;
+}
+
+namespace ash {
+
+namespace test {
+class WindowPositionerTest;
+}
+
+// WindowPositioner is used by the browser to move new popups automatically to
+// a usable position on the closest work area (of the active window).
+class ASH_EXPORT WindowPositioner {
+ public:
+  WindowPositioner();
+  ~WindowPositioner();
+
+  // Find a suitable screen position for a popup window and return it. The
+  // passed input position is only used to retrieve the width and height.
+  // The position is determined on the left / right / top / bottom first. If
+  // no smart space is found, the position will follow the standard what other
+  // operating systems do (default cascading style).
+  gfx::Rect GetPopupPosition(const gfx::Rect& old_pos);
+
+ protected:
+  friend class test::WindowPositionerTest;
+
+  // Find a smart way to position the popup window. If there is no space this
+  // function will return an empty rectangle.
+  gfx::Rect SmartPopupPosition(const gfx::Rect& old_pos,
+                               const gfx::Rect& work_area,
+                               int grid);
+
+  // Find the next available cascading popup position (on the given screen).
+  gfx::Rect NormalPopupPosition(const gfx::Rect& old_pos,
+                                const gfx::Rect& work_area);
+
+  // Align the location to the grid / snap to the right / bottom corner.
+  gfx::Rect AlignPopupPosition(const gfx::Rect &pos,
+                               const gfx::Rect &work_area,
+                               int grid);
+
+  // Constant exposed for unittest.
+  static const int kMinimumWindowOffset;
+
+  // The offset in X and Y for the next popup which opens.
+  int pop_position_offset_increment_x;
+  int pop_position_offset_increment_y;
+
+  // The position on the screen for the first popup which gets shown if no
+  // empty space can be found.
+  int popup_position_offset_from_screen_corner_x;
+  int popup_position_offset_from_screen_corner_y;
+
+  // The last used position.
+  int last_popup_position_x_;
+  int last_popup_position_y_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowPositioner);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_WINDOW_POSITIONER_H_