Scrollable should use scrollTo() when starting an animation

sky/framework/components/scrollable.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import '../animation/generators.dart';
 import '../animation/mechanics.dart';
 import '../animation/scroll_behavior.dart';
 import '../fn.dart';
 import '../theme/view-configuration.dart' as config;
 import 'dart:math' as math;
@@ skipping 51 matching lines @@
       return;
     _simulation.cancel();
     _simulation = null;
   }
 
   void _startSimulation(Particle particle) {
     _stopSimulation();
     _simulation = scrollBehavior.release(particle);
     if (_simulation == null)
       return;
-    _simulation.onTick.listen((_) {
-      setState(() {
-        _scrollOffset = particle.position;
-      });
-    });
+    _simulation.onTick.listen((_) {scrollTo(particle.position);});

[Hixie, 2015/04/14 16:52:30]

Keep it on three lines or use the => form.

   }
 
   Particle _createParticle([double velocity = 0.0]) {
     return new Particle(position: _scrollOffset, velocity: velocity);
   }
 
   void _handlePointerDown(_) {
     _stopSimulation();
   }
 
@@ skipping 11 matching lines @@
   }
 
   void _handleFlingCancel(sky.GestureEvent event) {
     _startSimulation(_createParticle());
   }
 
   void _handleWheel(sky.WheelEvent event) {
     scrollBy(-event.offsetY);
   }
 }