Add a timeDilation factor for debugging

sky/sdk/lib/base/scheduler.dart

Index: sky/sdk/lib/base/scheduler.dart
diff --git a/sky/sdk/lib/base/scheduler.dart b/sky/sdk/lib/base/scheduler.dart
index 272217d879b766fc22c8276272952d16e08f40f5..d1494412a0d1e3668a96211d2439d7b4b2eb8be5 100644
--- a/sky/sdk/lib/base/scheduler.dart
+++ b/sky/sdk/lib/base/scheduler.dart
@@ -4,6 +4,8 @@
 
 import 'dart:sky' as sky;
 
+import 'package:sky/base/debug.dart';
+
 typedef void Callback(double timeStamp);
 
 bool _haveScheduledVisualUpdate = false;
@@ -13,6 +15,8 @@ final List<Callback> _persistentCallbacks = new List<Callback>();
 Map<int, Callback> _transientCallbacks = new Map<int, Callback>();
 
 void _beginFrame(double timeStamp) {
+  timeStamp /= timeDilation;
+
   _haveScheduledVisualUpdate = false;
 
   Map<int, Callback> callbacks = _transientCallbacks;