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diff --git a/ash/frame/caption_buttons/frame_caption_button.h b/ash/frame/caption_buttons/frame_caption_button.h
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+++ b/ash/frame/caption_buttons/frame_caption_button.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_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
+#define ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
+
+#include "ash/ash_export.h"
+#include "ash/frame/caption_buttons/caption_button_types.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/views/controls/button/custom_button.h"
+
+namespace gfx {
+class SlideAnimation;
+}
+
+namespace ash {
+
+// Base class for the window caption buttons (minimize, maximize, restore,
+// close).
+class ASH_EXPORT FrameCaptionButton : public views::CustomButton {
+ public:
+  enum Animate {
+    ANIMATE_YES,
+    ANIMATE_NO
+  };
+
+  static const char kViewClassName[];
+
+  FrameCaptionButton(views::ButtonListener* listener, CaptionButtonIcon icon);
+  virtual ~FrameCaptionButton();
+
+  // Sets the images to use to paint the button. If |animate| is ANIMATE_YES,
+  // the button crossfades to the new visuals. If the image ids match those
+  // currently used by the button and |animate| is ANIMATE_NO the crossfade
+  // animation is progressed to the end.
+  void SetImages(CaptionButtonIcon icon,
+                 Animate animate,
+                 int icon_image_id,
+                 int inactive_icon_image_id,
+                 int hovered_background_image_id,
+                 int pressed_background_image_id);
+
+  // Returns true if the button is crossfading to new visuals set in
+  // SetImages().
+  bool IsAnimatingImageSwap() const;
+
+  // views::View overrides:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual const char* GetClassName() const OVERRIDE;
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+
+  void set_paint_as_active(bool paint_as_active) {
+    paint_as_active_ = paint_as_active;
+  }
+
+  CaptionButtonIcon icon() const {
+    return icon_;
+  }
+
+ protected:
+  // views::CustomButton override:
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+
+ private:
+  // Returns the icon image to paint based on |paint_as_active_|.
+  const gfx::ImageSkia& GetIconImageToPaint() const;
+
+  // Paints |to_center| centered within the button with |alpha|.
+  void PaintCentered(gfx::Canvas* canvas,
+                     const gfx::ImageSkia& to_center,
+                     int alpha);
+
+  // The button's current icon.
+  CaptionButtonIcon icon_;
+
+  // Whether the button should be painted as active.
+  bool paint_as_active_;
+
+  // The images and image ids used to paint the button.
+  int icon_image_id_;
+  int inactive_icon_image_id_;
+  int hovered_background_image_id_;
+  int pressed_background_image_id_;
+  gfx::ImageSkia icon_image_;
+  gfx::ImageSkia inactive_icon_image_;
+  gfx::ImageSkia hovered_background_image_;
+  gfx::ImageSkia pressed_background_image_;
+
+  // The icon image to crossfade from.
+  gfx::ImageSkia crossfade_icon_image_;
+
+  // Crossfade animation started when the button's images are changed by
+  // SetImages().
+  scoped_ptr<gfx::SlideAnimation> swap_images_animation_;
+
+  DISALLOW_COPY_AND_ASSIGN(FrameCaptionButton);
+};
+
+}  // namespace ash
+
+#endif  // ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_