Ink splashes should start at the touch point

sky/sdk/lib/framework/rendering/box.dart

Index: sky/sdk/lib/framework/rendering/box.dart
diff --git a/sky/sdk/lib/framework/rendering/box.dart b/sky/sdk/lib/framework/rendering/box.dart
index ddbd78e63c41f7a5e9153a53d83fe5d6b5ef3c8e..8eda5c04111bda6d0338d7b3daa20aa62eed9e0e 100644
--- a/sky/sdk/lib/framework/rendering/box.dart
+++ b/sky/sdk/lib/framework/rendering/box.dart
@@ -165,6 +165,13 @@ class BoxConstraints {
   String toString() => "BoxConstraints($minWidth<=w<$maxWidth, $minHeight<=h<$maxHeight)";
 }
 
+class BoxHitTestData extends HitTestData {
+  final Point localPosition;
+
+  BoxHitTestData(RenderBox entry, this.localPosition)
+    : super(entry);
+}
+
 class BoxParentData extends ParentData {
   Point _position = Point.origin;
   Point get position => _position;
@@ -225,7 +232,7 @@ abstract class RenderBox extends RenderObject {
 
   bool hitTest(HitTestResult result, { Point position }) {
     hitTestChildren(result, position: position);
-    result.add(this);
+    result.add(new BoxHitTestData(this, position));
     return true;
   }
   void hitTestChildren(HitTestResult result, { Point position }) { }
@@ -1073,7 +1080,7 @@ class RenderView extends RenderObject with RenderObjectWithChildMixin<RenderBox>
       if (childBounds.contains(position))
         child.hitTest(result, position: position);
     }
-    result.add(this);
+    result.add(new HitTestData(this));
     return true;
   }