Added support for obtaining the estimated memory usage of a Mirage.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@2174 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/image/BlankMirage.java

@@ -1,5 +1,5 @@
 //
-// $Id: BlankMirage.java,v 1.1 2003/01/13 22:49:46 mdb Exp $
+// $Id: BlankMirage.java,v 1.2 2003/01/17 02:30:21 mdb Exp $
 
 package com.threerings.media.image;
 
@@ -42,6 +42,12 @@ public class BlankMirage implements Mirage
         return false;
     }
 
+    // documentation inherited from interface
+    public long getEstimatedMemoryUsage ()
+    {
+        return 0;
+    }
+
     // documentation inherited from interface
     public BufferedImage getSnapshot ()
     {