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diff --git a/chrome/browser/ui/views/detachable_toolbar_view.h b/chrome/browser/ui/views/detachable_toolbar_view.h
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+// Copyright (c) 2010 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 CHROME_BROWSER_UI_VIEWS_DETACHABLE_TOOLBAR_VIEW_H_
+#define CHROME_BROWSER_UI_VIEWS_DETACHABLE_TOOLBAR_VIEW_H_
+#pragma once
+
+#include "chrome/browser/views/accessible_pane_view.h"
+
+class SkBitmap;
+struct SkRect;
+
+// DetachableToolbarView contains functionality common to views that can detach
+// from the Chrome frame, such as the BookmarkBarView and the Extension shelf.
+class DetachableToolbarView : public AccessiblePaneView {
+ public:
+  // The color gradient start value close to the edge of the divider.
+  static const SkColor kEdgeDividerColor;
+  // The color gradient value for the middle of the divider.
+  static const SkColor kMiddleDividerColor;
+
+  DetachableToolbarView() {}
+  virtual ~DetachableToolbarView() {}
+
+  // Whether the view is currently detached from the Chrome frame.
+  virtual bool IsDetached() const = 0;
+
+  // Gets the current state of the resize animation (show/hide).
+  virtual double GetAnimationValue() const = 0;
+
+  // Gets the current amount of overlap atop the browser toolbar.
+  virtual int GetToolbarOverlap() const = 0;
+
+  // Paints the background (including the theme image behind content area) when
+  // the bar/shelf is attached to the top toolbar.  |background_origin| is the
+  // origin to use for painting the theme image.
+  static void PaintBackgroundAttachedMode(gfx::Canvas* canvas,
+                                          views::View* view,
+                                          const gfx::Point& background_origin);
+
+  // Calculate the rect for the content area of the bar/shelf. This is only
+  // needed when the bar/shelf is detached from the Chrome frame (otherwise the
+  // content area is the whole area of the bar/shelf. When detached, however,
+  // only a small round rectangle is for drawing our content on. This calculates
+  // how big this area is, where it is located within the shelf and how round
+  // the edges should be.
+  static void CalculateContentArea(double animation_state,
+                                   double horizontal_padding,
+                                   double vertical_padding,
+                                   SkRect* rect,
+                                   double* roundness,
+                                   views::View* view);
+
+  // Paint the horizontal border separating the shelf/bar from the page content.
+  static void PaintHorizontalBorder(gfx::Canvas* canvas,
+                                    DetachableToolbarView* view);
+
+  // Paint the background of the content area (the surface behind the
+  // bookmarks or extension toolstrips). |rect| is the rectangle to paint
+  // the background within. |roundness| describes the roundness of the corners.
+  static void PaintContentAreaBackground(gfx::Canvas* canvas,
+                                         ThemeProvider* theme_provider,
+                                         const SkRect& rect,
+                                         double roundness);
+  // Paint the border around the content area (when in detached mode).
+  static void PaintContentAreaBorder(gfx::Canvas* canvas,
+                                     ThemeProvider* theme_provider,
+                                     const SkRect& rect,
+                                     double roundness);
+
+  // Paint a themed gradient divider at location |x|. |height| is the full
+  // height of the view you want to paint the divider into, not the height of
+  // the divider. The height of the divider will become:
+  //   |height| - 2 * |vertical_padding|.
+  // The color of the divider is a gradient starting with |top_color| at the
+  // top, and changing into |middle_color| and then over to |bottom_color| as
+  // you go further down.
+  static void PaintVerticalDivider(gfx::Canvas* canvas,
+                                   int x,
+                                   int height,
+                                   int vertical_padding,
+                                   const SkColor& top_color,
+                                   const SkColor& middle_color,
+                                   const SkColor& bottom_color);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DetachableToolbarView);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_DETACHABLE_TOOLBAR_VIEW_H_