Use package:sky imports consistently

sky/sdk/lib/widgets/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 'dart:sky' as sky;
 
-import '../animation/animation_performance.dart';
-import '../animation/curves.dart';
-import '../theme/shadows.dart';
-import 'animated_component.dart';
-import 'animation_builder.dart';
-import 'basic.dart';
-import 'scrollable_viewport.dart';
-import 'theme.dart';
+import 'package:sky/animation/animation_performance.dart';
+import 'package:sky/animation/curves.dart';
+import 'package:sky/theme/shadows.dart';
+import 'package:sky/widgets/animated_component.dart';
+import 'package:sky/widgets/animation_builder.dart';
+import 'package:sky/widgets/basic.dart';
+import 'package:sky/widgets/scrollable_viewport.dart';
+import 'package:sky/widgets/theme.dart';
 
 // TODO(eseidel): Draw width should vary based on device size:
 // http://www.google.com/design/spec/layout/structure.html#structure-side-nav
 
 // Mobile:
 // Width = Screen width − 56 dp
 // Maximum width: 320dp
 // Maximum width applies only when using a left nav. When using a right nav,
 // the panel can cover the full width of the screen.
 
@@ skipping 121 matching lines @@
       child: new Stack([ mask, content ]),
       onPointerDown: controller.handlePointerDown,
       onPointerMove: controller.handlePointerMove,
       onPointerUp: controller.handlePointerUp,
       onPointerCancel: controller.handlePointerCancel,
       onGestureFlingStart: controller.handleFlingStart
     );
   }
 
 }