Make NTP look good with themes.

chrome/browser/dom_ui/ntp_resource_cache.cc

 // 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.
 
 #include "chrome/browser/dom_ui/ntp_resource_cache.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "app/animation.h"
@@ skipping 441 matching lines @@
   subst2.push_back(SkColorToRGBAString(color_section_text));  // $$3
   subst2.push_back(SkColorToRGBAString(color_section_link));  // $$4
   subst2.push_back(
       tp->HasCustomImage(IDR_THEME_NTP_ATTRIBUTION) ? "block" : "none");  // $$5
   subst2.push_back(SkColorToRGBAString(color_link_underline));  // $$6
   subst2.push_back(SkColorToRGBAString(color_section_link_underline));  // $$7
   subst2.push_back(SkColorToRGBAString(color_section_header_text)); // $$8
   subst2.push_back(SkColorToRGBAString(
       color_section_header_text_hover)); // $$9
 
-  // A fully transparent version of the background color --- used for gradients.
+  subst3.push_back(SkColorToRGBAString(color_section_header_rule));  // $$$1
   subst3.push_back(SkColorToRGBAString(
-      SkColorSetA(color_background, 0)));  // $$$1
+      color_section_header_rule_light));  // $$$2
+  subst3.push_back(SkColorToRGBAString(
+      SkColorSetA(color_section_header_rule, 0)));  // $$$3
 
-  // TODO(aa): It seems we could generate sensible defaults for all these colors
-  // for better backward compat with old themes.
-  subst3.push_back(SkColorToRGBAString(color_section_header_rule));  // $$$2
-  subst3.push_back(SkColorToRGBAString(
-      color_section_header_rule_light));  // $$$3
 
   // Get our template.
   static const base::StringPiece new_tab_theme_css(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
       IDR_NEW_TAB_THEME_CSS));
 
   // Create the string from our template and the replacements.
   std::string css_string;
   css_string = ReplaceStringPlaceholders(new_tab_theme_css, subst, NULL);
   css_string = ReplaceStringPlaceholders(css_string, subst2, NULL);
   css_string = ReplaceStringPlaceholders(css_string, subst3, NULL);
 
   new_tab_css_ = new RefCountedBytes;
   new_tab_css_->data.resize(css_string.size());
   std::copy(css_string.begin(), css_string.end(),
             new_tab_css_->data.begin());
 }