[Mac][Material Design] Adjust bookmark spacing and folder menu drawing.

chrome/browser/ui/cocoa/bookmarks/bookmark_button.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.
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
 #import "chrome/browser/ui/cocoa/draggable_button.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #include "ui/base/window_open_disposition.h"
 
@@ skipping 196 matching lines @@
   // end of a drag operation (or, in fact, can be dragged to a completely
   // different window), so there is no way to retrieve the same BWC object after
   // a drag.
   BrowserWindowController* visibilityDelegate_;  // weak
 
   NSPoint dragMouseOffset_;
   NSPoint dragEndScreenLocation_;
   BOOL dragPending_;
   BOOL acceptsTrackIn_;
   NSTrackingArea* area_;
+  NSColor* backgroundColor_;
 }
 
 @property(assign, nonatomic) NSObject<BookmarkButtonDelegate>* delegate;
 @property(assign, nonatomic) BOOL acceptsTrackIn;
+@property(retain, nonatomic) NSColor* backgroundColor;
 
 // Return the bookmark node associated with this button, or NULL.
 - (const bookmarks::BookmarkNode*)bookmarkNode;
 
 // Return YES if this is a folder button (the node has subnodes).
 - (BOOL)isFolder;
 
 - (void)mouseDragged:(NSEvent*)theEvent;
 
 - (BOOL)acceptsTrackInFrom:(id)sender;
@@ skipping 21 matching lines @@
 + (BookmarkButton*)draggedButton;
 
 
 @end  // @interface BookmarkButton
 
 
 @interface BookmarkButton(TestingAPI)
 - (void)beginDrag:(NSEvent*)event;
 @end