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diff --git a/chrome/browser/views/tabs/tab_strip_wrapper.h b/chrome/browser/views/tabs/tab_strip_wrapper.h
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+++ b/chrome/browser/views/tabs/tab_strip_wrapper.h
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+// Copyright (c) 2009 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_VIEWS_TABS_TAB_STRIP_WRAPPER_H_
+#define CHROME_BROWSER_VIEWS_TABS_TAB_STRIP_WRAPPER_H_
+
+class BrowserTabStrip;
+namespace gfx {
+class Point;
+class Rect;
+}
+class TabStrip;
+class TabStripModel;
+namespace views {
+class View;
+}
+
+// A temporary interface to abstract the TabStrip implementation (which can be
+// either TabStrip or TabStrip2) from the rest of the Browser frontend code
+// while the new TabStrip is brought up.
+class TabStripWrapper {
+ public:
+  // Returns the preferred height of this TabStrip. This is based on the
+  // typical height of its constituent tabs.
+  virtual int GetPreferredHeight() = 0;
+
+  // Returns true if Tabs in this TabStrip are currently changing size or
+  // position.
+  virtual bool IsAnimating() const = 0;
+
+  // Set the background offset used by inactive tabs to match the frame image.
+  virtual void SetBackgroundOffset(gfx::Point offset) = 0;
+
+  // Returns true if the specified point(TabStrip coordinates) should be
+  // considered to be within the window caption area of the browser window.
+  virtual bool PointIsWithinWindowCaption(const gfx::Point& point) = 0;
+
+  // Returns true if a drag session is currently active.
+  virtual bool IsDragSessionActive() const = 0;
+
+  // Return true if this tab strip is compatible with the provided tab strip.
+  // Compatible tab strips can transfer tabs during drag and drop.
+  virtual bool IsCompatibleWith(TabStripWrapper* other) const = 0;
+
+  // Sets the bounds of the tab at the specified |tab_index|. |tab_bounds| are
+  // in TabStrip coordinates.
+  virtual void SetDraggedTabBounds(int tab_index,
+                                   const gfx::Rect& tab_bounds) = 0;
+
+  // Updates the loading animations displayed by tabs in the tabstrip to the
+  // next frame.
+  virtual void UpdateLoadingAnimations() = 0;
+
+  // Returns the views::View of the wrapped tabstrip, for layout and sizing.
+  virtual views::View* GetView() = 0;
+
+  // Shim to provide access to the BrowserTabStrip implementation for code only
+  // called from within TabStrip2::Enabled() == true blocks. Returns NULL when
+  // old TabStrip is in effect.
+  virtual BrowserTabStrip* AsBrowserTabStrip() = 0;
+
+  // Shim to provide access to the TabStrip implementation for code only called
+  // from within TabStrip2::Enabled() == false blocks. Returns NULL when the new
+  // TabStrip is in effect.
+  virtual TabStrip* AsTabStrip() = 0;
+
+  // Creates a TabStrip - either the old or new one depending on command line
+  // flags.
+  static TabStripWrapper* CreateTabStrip(TabStripModel* model);
+};
+
+#endif  // CHROME_BROWSER_VIEWS_TABS_TAB_STRIP_WRAPPER_H_