Bug 455836 - Native theme for menulist widget (ff toolbar). r=vladimir.

widget/src/qt/nsNativeThemeQt.cpp

@@ -234,11 +234,17 @@ nsNativeThemeQt::DrawWidgetBackground(nsIRenderingContext* aContext,
         style->drawComplexControl(QStyle::CC_ComboBox, &comboOpt, qPainter);
         break;
     }
-    case NS_THEME_DROPDOWN_BUTTON:
+    case NS_THEME_DROPDOWN_BUTTON: {
+        QStyleOptionComboBox option;
+
+        InitComboStyle(aWidgetType, aFrame, r, option);
+
+        style->drawPrimitive(QStyle::PE_FrameDefaultButton, &option, qPainter);
+        style->drawPrimitive(QStyle::PE_IndicatorSpinDown, &option, qPainter);
         break;
+    }
     case NS_THEME_DROPDOWN_TEXT:
     case NS_THEME_DROPDOWN_TEXTFIELD:
-        break;
     case NS_THEME_TEXTFIELD:
     case NS_THEME_TEXTFIELD_MULTILINE:
     case NS_THEME_LISTBOX: {