Mac: Optimize TabView drawing.

chrome/browser/ui/cocoa/tabs/tab_view.h

 // Copyright (c) 2011 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_UI_COCOA_TABS_TAB_VIEW_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_VIEW_H_
 
 #include <ApplicationServices/ApplicationServices.h>
 #import <Cocoa/Cocoa.h>
 
@@ skipping 57 matching lines @@
 
   NSPoint hoverPoint_;  // Current location of hover in view coords.
 
   // The location of the current mouseDown event in window coordinates.
   NSPoint mouseDownPoint_;
 
   NSCellStateValue state_;
 
   // The tool tip text for this tab view.
   base::scoped_nsobject<NSString> toolTipText_;
-
-  // A one-element mask image cache.  This cache makes drawing roughly 16%
-  // faster.
-  base::ScopedCFTypeRef<CGImageRef> maskCache_;
-  CGFloat maskCacheWidth_;
-  CGFloat maskCacheScale_;
 }
 
 @property(retain, nonatomic) NSString* title;
 @property(assign, nonatomic) NSRect titleFrame;
 @property(retain, nonatomic) NSColor* titleColor;
 @property(assign, nonatomic) BOOL titleHidden;
 
 // The state affects how the tab will be drawn.
 // NSOnState    -> active
 // NSMixedState -> selected
@@ skipping 32 matching lines @@
 
 // The TabController |controller_| is not the only owner of this view. If the
 // controller is released before this view, then we could be hanging onto a
 // garbage pointer. To prevent this, the TabController uses this interface to
 // clear the |controller_| pointer when it is dying.
 @interface TabView (TabControllerInterface)
 - (void)setController:(TabController*)controller;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_VIEW_H_