P2.1a.

chrome/browser/cocoa/tab_strip_controller.h

 // 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_COCOA_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_COCOA_TAB_STRIP_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
@@ skipping 69 matching lines @@
   // YES if we've successfully completed the initial layout. When this is
   // NO, we probably don't want to do any animation because we're just coming
   // into being.
   BOOL initialLayoutComplete_;
 
   // Width available for resizing the tabs (doesn't include the new tab
   // button). Used to restrict the available width when closing many tabs at
   // once to prevent them from resizing to fit the full width. If the entire
   // width should be used, this will have a value of |kUseFullAvailableWidth|.
   float availableResizeWidth_;
+
+  // Width the last tab should get in layout. Only non-null when
+  // |availableResizeWidth_| is not equal to |kUseFullAvailableWidth|.
+  scoped_ptr<CGFloat> lastClosedTabWidth_;
+
   // A tracking area that's the size of the tab strip used to be notified
   // when the mouse moves in the tab strip
   scoped_nsobject<NSTrackingArea> trackingArea_;
   TabView* hoveredTab_;  // weak. Tab that the mouse is hovering over
 
   // Array of subviews which are permanent (and which should never be removed),
   // such as the new-tab button, but *not* the tabs themselves.
   scoped_nsobject<NSMutableArray> permanentSubviews_;
 
   // The default favicon, so we can use one copy for all buttons.
@@ skipping 104 matching lines @@
 - (void)removeConstrainedWindow:(ConstrainedWindowMac*)window;
 - (void)updateDevToolsForContents:(TabContents*)contents;
 
 @end
 
 // Notification sent when the number of tabs changes. The object will be this
 // controller.
 extern NSString* const kTabStripNumberOfTabsChanged;
 
 #endif  // CHROME_BROWSER_COCOA_TAB_STRIP_CONTROLLER_H_