Report time-related media metrics milliseconds instead of seconds.

tools/perf/metrics/media.js

Index: tools/perf/metrics/media.js
diff --git a/tools/perf/metrics/media.js b/tools/perf/metrics/media.js
index 792e755de8017dfd1acd0db73807ef97a0b05bfa..57231af4d2faa0ba43fe1633b8fb19029b9d7742 100644
--- a/tools/perf/metrics/media.js
+++ b/tools/perf/metrics/media.js
@@ -149,8 +149,8 @@
     },
 
     stop: function() {
-      // Return delta time since start in secs.
-      return ((getCurrentTime() - this.start_) / 1000).toFixed(3);
+      // Return delta time since start in millisecs.
+      return ((getCurrentTime() - this.start_)).toFixed(3);
     }
   };