Alternate NTP: Don't hide bookmark bar on instant

chrome/browser/ui/cocoa/background_gradient_view.mm

 // 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.
 
 #include "chrome/browser/ui/cocoa/background_gradient_view.h"
 
 #import "chrome/browser/themes/theme_service.h"
 #import "chrome/browser/ui/cocoa/nsview_additions.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #include "grit/theme_resources.h"
@@ skipping 13 matching lines @@
 }
 
 - (id)initWithCoder:(NSCoder*)decoder {
   if ((self = [super initWithCoder:decoder])) {
     showsDivider_ = YES;
   }
   return self;
 }
 
 - (void)setShowsDivider:(BOOL)show {
+  if (showsDivider_ == show)
+    return;
   showsDivider_ = show;
   [self setNeedsDisplay:YES];
 }
 
 - (void)drawBackgroundWithOpaque:(BOOL)opaque {
   const NSRect bounds = [self bounds];
 
   if (opaque) {
     // If the background image is semi transparent then we need something
     // to blend against. Using 20% black gives us a color similar to Windows.
@@ skipping 36 matching lines @@
     NSColor* color = themeProvider->GetNSImageColorNamed(
         IDR_THEME_TOOLBAR_INACTIVE, true);
     if (color)
       return color;
   }
 
   return themeProvider->GetNSImageColorNamed(IDR_THEME_TOOLBAR, true);
 }
 
 @end