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diff --git a/chrome/browser/tabs/tab_strip_model_delegate.h b/chrome/browser/tabs/tab_strip_model_delegate.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_TABS_TAB_STRIP_MODEL_DELEGATE_H_
+#define CHROME_BROWSER_TABS_TAB_STRIP_MODEL_DELEGATE_H_
+#pragma once
+
+#include "chrome/common/page_transition_types.h"
+
+class Browser;
+class DockInfo;
+class GURL;
+class Profile;
+class SiteInstance;
+class TabContents;
+namespace gfx {
+class Rect;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// TabStripModelDelegate
+//
+//  A delegate interface that the TabStripModel uses to perform work that it
+//  can't do itself, such as obtain a container HWND for creating new
+//  TabContents, creating new TabStripModels for detached tabs, etc.
+//
+//  This interface is typically implemented by the controller that instantiates
+//  the TabStripModel (in our case the Browser object).
+//
+///////////////////////////////////////////////////////////////////////////////
+class TabStripModelDelegate {
+ public:
+  enum {
+    TAB_MOVE_ACTION = 1,
+    TAB_TEAROFF_ACTION = 2
+  };
+
+  // Adds what the delegate considers to be a blank tab to the model.
+  virtual TabContents* AddBlankTab(bool foreground) = 0;
+  virtual TabContents* AddBlankTabAt(int index, bool foreground) = 0;
+
+  // Asks for a new TabStripModel to be created and the given tab contents to
+  // be added to it. Its size and position are reflected in |window_bounds|.
+  // If |dock_info|'s type is other than NONE, the newly created window should
+  // be docked as identified by |dock_info|. Returns the Browser object
+  // representing the newly created window and tab strip. This does not
+  // show the window, it's up to the caller to do so.
+  virtual Browser* CreateNewStripWithContents(TabContents* contents,
+                                              const gfx::Rect& window_bounds,
+                                              const DockInfo& dock_info,
+                                              bool maximize) = 0;
+
+  // Creates a new Browser object and window containing the specified
+  // |contents|, and continues a drag operation that began within the source
+  // window's tab strip. |window_bounds| are the bounds of the source window in
+  // screen coordinates, used to place the new window, and |tab_bounds| are the
+  // bounds of the dragged Tab view in the source window, in screen coordinates,
+  // used to place the new Tab in the new window.
+  virtual void ContinueDraggingDetachedTab(TabContents* contents,
+                                           const gfx::Rect& window_bounds,
+                                           const gfx::Rect& tab_bounds) = 0;
+
+  // Determines what drag actions are possible for the specified strip.
+  virtual int GetDragActions() const = 0;
+
+  // Creates an appropriate TabContents for the given URL. This is handled by
+  // the delegate since the TabContents may require special circumstances to
+  // exist for it to be constructed (e.g. a parent HWND).
+  // If |defer_load| is true, the navigation controller doesn't load the url.
+  // If |instance| is not null, its process is used to render the tab.
+  virtual TabContents* CreateTabContentsForURL(
+      const GURL& url,
+      const GURL& referrer,
+      Profile* profile,
+      PageTransition::Type transition,
+      bool defer_load,
+      SiteInstance* instance) const = 0;
+
+  // Returns whether some contents can be duplicated.
+  virtual bool CanDuplicateContentsAt(int index) = 0;
+
+  // Duplicates the contents at the provided index and places it into its own
+  // window.
+  virtual void DuplicateContentsAt(int index) = 0;
+
+  // Called when a drag session has completed and the frame that initiated the
+  // the session should be closed.
+  virtual void CloseFrameAfterDragSession() = 0;
+
+  // Creates an entry in the historical tab database for the specified
+  // TabContents.
+  virtual void CreateHistoricalTab(TabContents* contents) = 0;
+
+  // Runs any unload listeners associated with the specified TabContents before
+  // it is closed. If there are unload listeners that need to be run, this
+  // function returns true and the TabStripModel will wait before closing the
+  // TabContents. If it returns false, there are no unload listeners and the
+  // TabStripModel can close the TabContents immediately.
+  virtual bool RunUnloadListenerBeforeClosing(TabContents* contents) = 0;
+
+  // Returns true if a tab can be restored.
+  virtual bool CanRestoreTab() = 0;
+
+  // Restores the last closed tab if CanRestoreTab would return true.
+  virtual void RestoreTab() = 0;
+
+  // Returns whether some contents can be closed.
+  virtual bool CanCloseContentsAt(int index) = 0;
+
+  // Returns true if we should allow "bookmark all tabs" in this window; this is
+  // true when there is more than one bookmarkable tab open.
+  virtual bool CanBookmarkAllTabs() const = 0;
+
+  // Creates a bookmark folder containing a bookmark for all open tabs.
+  virtual void BookmarkAllTabs() = 0;
+
+  // Returns true if any of the tabs can be closed.
+  virtual bool CanCloseTab() const = 0;
+
+  // Returns true if the vertical tabstrip presentation should be used.
+  virtual bool UseVerticalTabs() const = 0;
+
+  // Toggles the use of the vertical tabstrip.
+  virtual void ToggleUseVerticalTabs() = 0;
+
+  // Returns true if the tab strip can use large icons.
+  virtual bool LargeIconsPermitted() const = 0;
+
+ protected:
+  virtual ~TabStripModelDelegate() {}
+};
+
+#endif  // CHROME_BROWSER_TABS_TAB_STRIP_MODEL_DELEGATE_H_