Add material shadows to toolbar and drawer

sky/sdk/lib/framework/components2/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 '../animation/animated_value.dart';
 import '../animation/curves.dart';
 import '../fn2.dart';
-import '../theme/colors.dart';
+import '../theme2/colors.dart';
+import '../theme2/shadows.dart';
 import 'animated_component.dart';
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'material.dart';
 import 'package:vector_math/vector_math.dart';
 
 const double _kWidth = 304.0;
 const double _kMinFlingVelocity = 0.4;
 const double _kBaseSettleDurationMS = 246.0;
 const double _kMaxSettleDurationMS = 600.0;
@@ skipping 84 matching lines @@
     this.children,
     this.level: 0
   }) : super(key: key) {
     animateField(controller.position, #_position);
   }
 
   UINode build() {
     Matrix4 transform = new Matrix4.identity();
     transform.translate(_position);
 
-    Color maskColor = new Color(((_position / _kWidth + 1) * 0xFF).floor() << 24);
+    double scaler = _position / _kWidth + 1;
+    Color maskColor = new Color.fromARGB((0x7F * scaler).floor(), 0, 0, 0);
 
     var mask = new EventListenerNode(
       new Container(decoration: new BoxDecoration(backgroundColor: maskColor)),
       onGestureTap: controller.handleMaskTap,
       onGestureFlingStart: controller.handleFlingStart
     );
 
-    Material content = new Material(
-      content: new Container(
-        decoration: new BoxDecoration(backgroundColor: new Color(0xFFFFFFFF)),
-        width: _kWidth,
-        transform: transform,
-        child: new BlockContainer(children: children)
-      ),
-      level: level);
+    Container content = new Container(
+      decoration: new BoxDecoration(
+        backgroundColor: Grey[50],
+        boxShadow: Shadow[level]),
+      width: _kWidth,
+      transform: transform,
+      child: new BlockContainer(children: children)
+    );
 
     return new EventListenerNode(
       new StackContainer(
         children: [ mask, content ]
       ),
       onPointerDown: controller.handlePointerDown,
       onPointerMove: controller.handlePointerMove,
       onPointerUp: controller.handlePointerUp,
       onPointerCancel: controller.handlePointerCancel
     );
   }
 }