[Effen] Start removing 'position'.

sky/framework/components/drawer.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 'animated_component.dart';
 import '../animation/animated_value.dart';
 import '../animation/curves.dart';
 import '../fn.dart';
 import '../theme/colors.dart';
 import 'dart:math' as math;
@@ skipping 79 matching lines @@
 }
 
 class Drawer extends AnimatedComponent {
   // TODO(abarth): We need a better way to become a container for absolutely
   // positioned elements.
   static final Style _style = new Style('''
     transform: translateX(0);''');
 
   static final Style _maskStyle = new Style('''
     background-color: black;
-    will-change: opacity;
-    position: absolute;
-    top: 0;
-    left: 0;
-    bottom: 0;
-    right: 0;'''
+    will-change: opacity;'''
   );
 
   static final Style _contentStyle = new Style('''
     background-color: ${Grey[50]};
     will-change: transform;
-    position: absolute;
-    width: ${_kWidth}px;
-    top: 0;
-    left: 0;
-    bottom: 0;'''
+    width: ${_kWidth}px;'''
   );
 
   List<UINode> children;
   int level;
   DrawerController controller;
 
   double _position;
 
   Drawer({
     Object key,
@@ skipping 19 matching lines @@
 
     Material content = new Material(
       content: new Container(
         style: _contentStyle,
         inlineStyle: contentInlineStyle,
         children: children
       ),
       level: level);
 
     return new EventListenerNode(
-      new Container(
+      new FillStackContainer(
         style: _style,
         children: [ mask, content ]
       ),
       onPointerDown: controller.handlePointerDown,
       onPointerMove: controller.handlePointerMove,
       onPointerUp: controller.handlePointerUp,
       onPointerCancel: controller.handlePointerCancel
     );
   }
 }