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diff --git a/chromium/ash/shelf/alternate_app_list_button.h b/chromium/ash/shelf/alternate_app_list_button.h
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+++ b/chromium/ash/shelf/alternate_app_list_button.h
@@ -0,0 +1,59 @@
+// 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_SHELF_ALTERNATE_APP_LIST_BUTTON_H_
+#define ASH_SHELF_ALTERNATE_APP_LIST_BUTTON_H_
+
+#include "ui/views/controls/button/image_button.h"
+
+namespace ash {
+
+class ShelfWidget;
+
+namespace internal {
+
+class ShelfButtonHost;
+
+// Button used for the AppList icon on the shelf.
+// This class is an alternate implementation to ash::internal::AppListButton
+// for the purposes of testing an alternate shelf layout
+// (see ash_switches: UseAlternateShelfLayout).
+class AlternateAppListButton : public views::ImageButton {
+ public:
+  // Bounds size (inset) required for the app icon image (in pixels).
+  static const int kImageBoundsSize;
+
+  AlternateAppListButton(views::ButtonListener* listener,
+                         ShelfButtonHost* host,
+                         ShelfWidget* shelf_widget);
+  virtual ~AlternateAppListButton();
+
+ protected:
+  // views::ImageButton overrides:
+  virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseCaptureLost() OVERRIDE;
+  virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseMoved(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
+
+  // ui::EventHandler overrides:
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+
+ private:
+  ShelfButtonHost* host_;
+  // Reference to the shelf widget containing this button, owned by the
+  // root window controller.
+  ShelfWidget* shelf_widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(AlternateAppListButton);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SHELF_ALTERNATE_APP_LIST_BUTTON_H_