Unbanish memory screen and new UX

Give memory screen a makeover so that it looks nice enough to be
restored to its rightful home.

Bug: 20694769
Change-Id: I2f6933037b3fbbfb0d9fe5e3ca821ef59e171faa
diff --git a/src/com/android/settings/Utils.java b/src/com/android/settings/Utils.java
index d3d515e..b7f62a3 100644
--- a/src/com/android/settings/Utils.java
+++ b/src/com/android/settings/Utils.java
@@ -147,6 +147,8 @@
     private static final int SECONDS_PER_HOUR = 60 * 60;
     private static final int SECONDS_PER_DAY = 24 * 60 * 60;
 
+    public static final String OS_PKG = "os";
+
     private static SparseArray<Bitmap> sDarkDefaultUserBitmapCache = new SparseArray<Bitmap>();
 
     /**