Implement select element list box with shadow DOM.

Source/WebCore/rendering/RenderTheme.cpp

Index: Source/WebCore/rendering/RenderTheme.cpp
diff --git a/Source/WebCore/rendering/RenderTheme.cpp b/Source/WebCore/rendering/RenderTheme.cpp
index c71e6b8abdb8964f07b6f8fe52e386b05451cc00..fd56df85ffb095c1e356fa236bd3057af28c2186 100644
--- a/Source/WebCore/rendering/RenderTheme.cpp
+++ b/Source/WebCore/rendering/RenderTheme.cpp
@@ -1090,6 +1090,10 @@ Color RenderTheme::systemColor(int cssValueId) const
         return 0xFFFFFFFF;
     case CSSValueActivecaption:
         return 0xFFCCCCCC;
+    case CSSValueActivelistboxselection:
+        return activeListBoxSelectionBackgroundColor();
+    case CSSValueActivelistboxselectiontext:
+        return activeListBoxSelectionForegroundColor();
     case CSSValueAppworkspace:
         return 0xFFFFFFFF;
     case CSSValueBackground:
@@ -1116,6 +1120,10 @@ Color RenderTheme::systemColor(int cssValueId) const
         return 0xFFFFFFFF;
     case CSSValueInactivecaptiontext:
         return 0xFF7F7F7F;
+    case CSSValueInactivelistboxselection:
+        return inactiveListBoxSelectionBackgroundColor();
+    case CSSValueInactivelistboxselectiontext:
+        return inactiveListBoxSelectionForegroundColor();
     case CSSValueInfobackground:
         return 0xFFFBFCC5;
     case CSSValueInfotext: