Mac: Draw download item background like windows does if a theme is installed.

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 33 matching lines @@
 - (void)setShouldTheme:(BOOL)shouldTheme;
 
 - (void)drawBorderAndFillForTheme:(GTMTheme*)theme
                       controlView:(NSView*)controlView
                         outerPath:(NSBezierPath*)outerPath
                         innerPath:(NSBezierPath*)innerPath
               showClickedGradient:(BOOL)showClickedGradient
             showHighlightGradient:(BOOL)showHighlightGradient
                        hoverAlpha:(CGFloat)hoverAlpha
                            active:(BOOL)active
-                        cellFrame:(NSRect)cellFrame;
+                        cellFrame:(NSRect)cellFrame
+                  defaultGradient:(NSGradient*)defaultGradient;
 
 // An image to underlay beneath the existing image; not themed. May be nil.
 - (NSImage*)underlayImage;
 - (void)setUnderlayImage:(NSImage*)image;
 
 // Let the view know when the mouse moves in and out. A timer will update
 // the current hoverAlpha_ based on these events.
 - (void)setMouseInside:(BOOL)flag animate:(BOOL)animate;
 
 @property(assign, nonatomic)CGFloat hoverAlpha;
 @end
 
 @interface GradientButtonCell(TestingAPI)
 - (BOOL)isMouseInside;
 @end
 
 #endif  // CHROME_BROWSER_COCOA_CHROMIUM_BUTTON_CELL_H_