Ink splashes should start at the touch point

sky/sdk/lib/framework/components2/ink_well.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/animated_value.dart';
 import '../animation/curves.dart';
 import '../fn2.dart';
 import '../rendering/box.dart';
 import '../rendering/flex.dart';
 import '../rendering/object.dart';
@@ skipping 48 matching lines @@
     sky.Paint paint = new sky.Paint()..color = new sky.Color(opacity << 24);
     canvas.drawCircle(position.x, position.y, _radius.value, paint);
   }
 }
 
 class RenderInkWell extends RenderProxyBox {
   RenderInkWell({ RenderBox child }) : super(child);
 
   final List<InkSplash> _splashes = new List<InkSplash>();
 
-  void handleEvent(sky.Event event) {
+  void handleEvent(sky.Event event, BoxHitTestData data) {
     switch (event.type) {
       case 'gesturetapdown':
         // TODO(abarth): We should position the splash at the location of the tap.
-        _startSplash(event.primaryPointer, new Point(size.width / 2.0, size.height / 2.0));
+        _startSplash(event.primaryPointer, data.localPosition);
         break;
       case 'gesturetap':
         _confirmSplash(event.primaryPointer);
         break;
     }
   }
 
   void _startSplash(int pointer, Point position) {
     _splashes.add(new InkSplash(pointer, position, this));
     markNeedsPaint();
@@ skipping 34 matching lines @@
   UINode build() {
     return new InkWellWrapper(
       child: new FlexContainer(
         direction: FlexDirection.horizontal,
         justifyContent: FlexJustifyContent.center,
         children: children
       )
     );
   }
 }