Add theme support for the yellow star on the Mac....

chrome/browser/cocoa/gradient_button_cell.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_CHROMIUM_BUTTON_CELL_H_
 #define CHROME_BROWSER_COCOA_CHROMIUM_BUTTON_CELL_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
@@ skipping 12 matching lines @@
 };
 typedef NSInteger ButtonType;
 
 @interface GradientButtonCell : NSButtonCell {
  @private
   // Custom drawing means we need to perform our own mouse tracking if
   // the cell is setShowsBorderOnlyWhileMouseInside:YES.
   BOOL isMouseInside_;
   scoped_nsobject<NSTrackingArea> trackingArea_;
   BOOL shouldTheme_;
+
+  scoped_nsobject<NSImage> underlayImage_;
 }
+
 // Turn off theming.  Temporary work-around.
 - (void)setShouldTheme:(BOOL)shouldTheme;
+
+// An image to underlay beneath the existing image; not themed. May be nil.
+- (NSImage*)underlayImage;
+- (void)setUnderlayImage:(NSImage*)image;
+
 @end
 
 @interface GradientButtonCell(TestingAPI)
 - (BOOL)isMouseInside;
 @end
 
 #endif  // CHROME_BROWSER_COCOA_CHROMIUM_BUTTON_CELL_H_