Delete drawerController and make drawer handle back behavior natively

sky/sdk/example/fitness/lib/settings.dart

Index: sky/sdk/example/fitness/lib/settings.dart
diff --git a/sky/sdk/example/fitness/lib/settings.dart b/sky/sdk/example/fitness/lib/settings.dart
index d419b8ce8b4cc5425e2106b2afe1e3dd3f243f5c..51ac6f7532d3ac1028875a812213013f7f832848 100644
--- a/sky/sdk/example/fitness/lib/settings.dart
+++ b/sky/sdk/example/fitness/lib/settings.dart
@@ -9,6 +9,7 @@ import 'package:sky/widgets/icon_button.dart';
 import 'package:sky/widgets/material.dart';
 import 'package:sky/widgets/navigator.dart';
 import 'package:sky/widgets/scaffold.dart';
+import 'package:sky/widgets/scrollable_viewport.dart';
 import 'package:sky/widgets/tool_bar.dart';
 import 'package:sky/widgets/theme.dart';
 
@@ -45,25 +46,27 @@ class SettingsFragment extends Component {
   Widget buildSettingsPane() {
     return new Material(
       type: MaterialType.canvas,
-      child: new Container(
-        padding: const EdgeDims.symmetric(vertical: 20.0),
-        child: new Block([
-          new DrawerItem(
-            onPressed: () { _handleBackupChanged(!(backup == BackupMode.enabled)); },
-            children: [
-              new Flexible(child: new Text('Back up data to the cloud')),
-              new Switch(value: backup == BackupMode.enabled, onChanged: _handleBackupChanged)
-            ]
-          ),
-          new DrawerItem(
-            children: [
-              new Block([
-                new Text('Height'),
-                new Text("6'2\"", style: Theme.of(this).text.caption),
-              ])
-            ]
-          ),
-        ])
+      child: new ScrollableViewport(
+        child: new Container(
+          padding: const EdgeDims.symmetric(vertical: 20.0),
+          child: new Block([
+            new DrawerItem(
+              onPressed: () { _handleBackupChanged(!(backup == BackupMode.enabled)); },
+              children: [
+                new Flexible(child: new Text('Back up data to the cloud')),
+                new Switch(value: backup == BackupMode.enabled, onChanged: _handleBackupChanged)
+              ]
+            ),
+            new DrawerItem(
+              children: [
+                new Flex([
+                  new Text('Height'),
+                  new Text("6'2\"", style: Theme.of(this).text.caption),
+                ], direction: FlexDirection.vertical, alignItems: FlexAlignItems.start)
+              ]
+            ),
+          ])
+        )
       )
     );
   }