Add an accordian effect to NTP.

chrome/browser/themes/browser_theme_provider.h

 // Copyright (c) 2010 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_THEMES_BROWSER_THEME_PROVIDER_H_
 #define CHROME_BROWSER_THEMES_BROWSER_THEME_PROVIDER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 56 matching lines @@
     COLOR_BACKGROUND_TAB_TEXT,
     COLOR_BOOKMARK_TEXT,
     COLOR_NTP_BACKGROUND,
     COLOR_NTP_TEXT,
     COLOR_NTP_LINK,
     COLOR_NTP_LINK_UNDERLINE,
     COLOR_NTP_HEADER,
     COLOR_NTP_SECTION,
     COLOR_NTP_SECTION_HEADER_TEXT,
     COLOR_NTP_SECTION_HEADER_TEXT_HOVER,
+    COLOR_NTP_SECTION_HEADER_RULE,
+    COLOR_NTP_SECTION_HEADER_RULE_LIGHT,
     COLOR_NTP_SECTION_TEXT,
     COLOR_NTP_SECTION_LINK,
     COLOR_NTP_SECTION_LINK_UNDERLINE,
     COLOR_CONTROL_BACKGROUND,
     COLOR_BUTTON_BACKGROUND,
     TINT_BUTTONS,
     TINT_FRAME,
     TINT_FRAME_INACTIVE,
     TINT_FRAME_INCOGNITO,
     TINT_FRAME_INCOGNITO_INACTIVE,
@@ skipping 181 matching lines @@
 
   scoped_refptr<BrowserThemePack> theme_pack_;
 
   // The number of infobars currently displayed.
   int number_of_infobars_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserThemeProvider);
 };
 
 #endif  // CHROME_BROWSER_THEMES_BROWSER_THEME_PROVIDER_H_