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diff --git a/chrome/browser/cocoa/tab_strip_controller.h b/chrome/browser/cocoa/tab_strip_controller.h
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+++ b/chrome/browser/cocoa/tab_strip_controller.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_COCOA_TAB_STRIP_CONTROLLER_H_
+#define CHROME_BROWSER_COCOA_TAB_STRIP_CONTROLLER_H_
+
+#import <Cocoa/Cocoa.h>
+
+@class TabBarView;
+class TabStripBridge;
+class TabStripModel;
+
+// A class that handles managing the tab strip in a browser window. It uses
+// a supporting C++ bridge object to register for notifications from the
+// TabStripModel. The Obj-C part of this class handles drag and drop and all
+// the other Cocoa-y aspects.
+//
+// When a new tab is created, it loads the contents, including
+// toolbar, from a separate nib file and replaces the contentView of the
+// window. As tabs are switched, the single child of the contentView is
+// swapped around to hold the contents (toolbar and all) representing that tab.
+
+@interface TabStripController : NSObject {
+ @private
+  TabBarView* tabView_;  // weak
+  NSButton* newTabButton_;
+  TabStripBridge* bridge_;
+  TabStripModel* model_;
+  // maps TabContents to a TabContentsController (which owns the parent view
+  // for the toolbar and associated tab contents)
+  NSMutableDictionary* tabContentsToController_;
+}
+
+// Initialize the controller with a view and model. Both must be non-nil.
+- (id)initWithView:(TabBarView*)view model:(TabStripModel*)model;
+
+@end
+
+#endif  // CHROME_BROWSER_COCOA_TAB_STRIP_CONTROLLER_H_