[Mac][Material Design] Show light default favicon in Incognito mode.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h

 // Copyright (c) 2012 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_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 #include <stdint.h>
 
@@ skipping 185 matching lines @@
   // The folder image so we can use one copy for all buttons
   base::scoped_nsobject<NSImage> folderImage_;
 
   // The Material Design Incognito folder image so we can use one copy for all
   // buttons
   base::scoped_nsobject<NSImage> folderImageWhite_;
 
   // The default image, so we can use one copy for all buttons.
   base::scoped_nsobject<NSImage> defaultImage_;
 
+  // The Incognito version of the default image.
+  base::scoped_nsobject<NSImage> defaultImageIncognito_;
+
   // If the bar is disabled, we hide it and ignore show/hide commands.
   // Set when using fullscreen mode.
   BOOL barIsEnabled_;
 
   // Bridge from Chrome-style C++ notifications (e.g. derived from
   // BookmarkModelObserver)
   std::unique_ptr<BookmarkBarBridge> bridge_;
 
   // Delegate that is informed about state changes in the bookmark bar.
   id<BookmarkBarControllerDelegate> delegate_;  // weak
@@ skipping 239 matching lines @@
 - (BookmarkButton*)buttonForDroppingOnAtPoint:(NSPoint)point;
 - (BOOL)isEventAnExitEvent:(NSEvent*)event;
 - (BOOL)shrinkOrHideView:(NSView*)view forMaxX:(CGFloat)maxViewX;
 - (void)unhighlightBookmark:(const bookmarks::BookmarkNode*)node;
 
 // The following are for testing purposes only and are not used internally.
 - (NSMenu *)menuForFolderNode:(const bookmarks::BookmarkNode*)node;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_