Sky support for flexbox justify content

sky/sdk/lib/framework/components2/ink_well.dart

Index: sky/sdk/lib/framework/components2/ink_well.dart
diff --git a/sky/sdk/lib/framework/components2/ink_well.dart b/sky/sdk/lib/framework/components2/ink_well.dart
index 831421e1801cc0649e35cd6316923ba979d7e4d8..2b2efc750361f962c6f2ae984827e8f8c78afc5d 100644
--- a/sky/sdk/lib/framework/components2/ink_well.dart
+++ b/sky/sdk/lib/framework/components2/ink_well.dart
@@ -28,7 +28,10 @@ class InkWell extends Component implements ScrollClient {
   InkWell({ Object key, this.children }) : super(key: key);
 
   UINode build() {
-    return new FlexContainer(direction: FlexDirection.horizontal, children: children);
+    return new FlexContainer(
+      direction: FlexDirection.horizontal,
+      justifyContent: FlexJustifyContent.center,
+      children: children);
     // List<UINode> childrenIncludingSplashes = [];
 
     // if (_splashes != null) {