Clip inkwell splash around the floating action button

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

Index: sky/sdk/lib/framework/components2/floating_action_button.dart
diff --git a/sky/sdk/lib/framework/components2/floating_action_button.dart b/sky/sdk/lib/framework/components2/floating_action_button.dart
index d660b332bc7b7b770e58c257fe169e7ec7653a68..45680a8b7094af3ca5edeb299e7ab4abdbc61c43 100644
--- a/sky/sdk/lib/framework/components2/floating_action_button.dart
+++ b/sky/sdk/lib/framework/components2/floating_action_button.dart
@@ -40,10 +40,14 @@ class FloatingActionButton extends Component {
           paint.setDrawLooper(builder.build());
           canvas.drawCircle(radius, radius, radius, paint);
         },
-        child: new Container(
-          width: _kSize,
-          height: _kSize,
-          child: new InkWell(children: children))),
+        child: new ClipOval(
+          child: new Container(
+            width: _kSize,
+            height: _kSize,
+            child: new InkWell(children: children)
+          )
+        )
+      ),
       level: level);
   }