Avoiding a divide-by-zero exception in CalibratingTimer when Perf.highResFrequency() returns 0 on certain machines.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@1179 ed5b42cb-e716-0410-a449-f6a68f950b19

src/main/java/com/threerings/media/timer/CalibratingTimer.java

@@ -54,8 +54,14 @@ public abstract class CalibratingTimer
     // documentation inherited from interface
     public long getElapsedMicros ()
     {
+        // Some machines will have set _microDivider to 0
+        if (_microDivider == 0) {
+            // Just convert our millisecond value instead
+            return getElapsedMillis() * 1000;
+        } else {
             return elapsed() / _microDivider;
         }
+    }
 
     // documentation inherited from interface
     public long getElapsedMillis ()