Add an accordian effect to NTP.

chrome/browser/themes/browser_theme_provider.cc

Index: chrome/browser/themes/browser_theme_provider.cc
diff --git a/chrome/browser/themes/browser_theme_provider.cc b/chrome/browser/themes/browser_theme_provider.cc
index 55a1c17773b8e2e29684277511ad24c259184341..04075a806f50d4c4f8f39eea6d6e66c6ced21515 100644
--- a/chrome/browser/themes/browser_theme_provider.cc
+++ b/chrome/browser/themes/browser_theme_provider.cc
@@ -80,6 +80,9 @@ const SkColor kDefaultColorNTPSection = SkColorSetRGB(229, 239, 254);
 const SkColor kDefaultColorNTPSectionText = SK_ColorBLACK;
 const SkColor kDefaultColorNTPSectionLink = SkColorSetRGB(6, 55, 116);
 const SkColor kDefaultColorNTPSectionHeaderText = SkColorSetRGB(76, 76, 76);
+const SkColor kDefaultColorNTPSectionHeaderRule = SkColorSetRGB(179, 179, 179);
+const SkColor kDefaultColorNTPSectionHeaderRuleLight =
+    SkColorSetRGB(220, 220, 220);
 const SkColor kDefaultColorControlBackground = SkColorSetARGB(0, 0, 0, 0);
 const SkColor kDefaultColorButtonBackground = SkColorSetARGB(0, 0, 0, 0);
 #if defined(OS_MACOSX)
@@ -449,6 +452,10 @@ SkColor BrowserThemeProvider::GetDefaultColor(int id) {
       return kDefaultColorNTPSectionHeaderText;
     case COLOR_NTP_SECTION_HEADER_TEXT_HOVER:
       return kDefaultColorNTPText;
+    case COLOR_NTP_SECTION_HEADER_RULE:
+      return kDefaultColorNTPSectionHeaderRule;
+    case COLOR_NTP_SECTION_HEADER_RULE_LIGHT:
+      return kDefaultColorNTPSectionHeaderRuleLight;
     case COLOR_CONTROL_BACKGROUND:
       return kDefaultColorControlBackground;
     case COLOR_BUTTON_BACKGROUND: