Set a dark theme for SystemUI.

The default theme for the platform has changed to a
light variant. This puts SystemUI back in the dark.

Bug: 13635952
Change-Id: I230a2078ba6bf5a79c768f0e357fcbd75f283cf8
diff --git a/packages/SystemUI/res/values/styles.xml b/packages/SystemUI/res/values/styles.xml
index 76cadd7..c2d584b 100644
--- a/packages/SystemUI/res/values/styles.xml
+++ b/packages/SystemUI/res/values/styles.xml
@@ -169,5 +169,7 @@
         <!-- Note: must be dp to fit in status bar -->
         <item name="android:textSize">14dp</item>
     </style>
-    
+
+    <style name="systemui_theme" parent="@android:style/Theme.DeviceDefault" />
+
 </resources>