Make the drawer, popup menus, dialogs, and settings page scrollable.

sky/sdk/lib/widgets/dialog.dart

Index: sky/sdk/lib/widgets/dialog.dart
diff --git a/sky/sdk/lib/widgets/dialog.dart b/sky/sdk/lib/widgets/dialog.dart
index 20e8650cbf3467dea34145d5d483af8f95a7409e..255eb39c3d58cb6cf3453310c27974d4067ad552 100644
--- a/sky/sdk/lib/widgets/dialog.dart
+++ b/sky/sdk/lib/widgets/dialog.dart
@@ -6,7 +6,8 @@ import '../theme/colors.dart' as colors;
 import 'basic.dart';
 import 'default_text_style.dart';
 import 'material.dart';
-import "theme.dart";
+import 'scrollable_viewport.dart';
+import 'theme.dart';
 
 /// A material design dialog
 ///
@@ -88,7 +89,9 @@ class Dialog extends Component {
               level: 4,
               color: _color,
               child: new ShrinkWrapWidth(
-                child: new Block(children)
+                child: new ScrollableViewport(
+                  child: new Block(children)
+                )
               )
             )
           )