Implement feature where tabs don't resize when using the close box until the ...

chrome/browser/cocoa/tab_strip_controller.h

 // 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>
 
 #include "base/scoped_nsobject.h"
@@ skipping 39 matching lines @@
 
   // These values are only used during a drag, and override tab positioning.
   TabView* placeholderTab_; // weak. Tab being dragged
   NSRect placeholderFrame_;  // Frame to use
   CGFloat placeholderStretchiness_; // Vertical force shown by streching tab.
   // Frame targets for all the current views.
   // target frames are used because repeated requests to [NSView animator].
   // aren't coalesced, so we store frames to avoid redundant calls.
   scoped_nsobject<NSMutableDictionary> targetFrames_;
   NSRect newTabTargetFrame_;
+
+  // 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_;
+  // A tracking area that's the size of the tab strip used to be notified
+  // when the mouse leaves the tab strip. It's installed when the user clicks
+  // the close box of a tab and is removed when they move the mouse outside
+  // of the strip. When they do, we resize the tabs to use all available
+  // space.
+  scoped_nsobject<NSTrackingArea> closeTabTrackingArea_;
 }
 
 // Initialize the controller with a view and browser that contains
 // everything else we'll need. |switchView| is the view whose contents get
 // "switched" every time the user switches tabs. The children of this view
 // will be released, so if you want them to stay around, make sure
 // you have retained them.
 - (id)initWithView:(TabStripView*)view
         switchView:(NSView*)switchView
              model:(TabStripModel*)model;
@@ skipping 33 matching lines @@
 
 // Default height for tabs.
 + (CGFloat)defaultTabHeight;
 @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_