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

sky/sdk/lib/widgets/popup_menu.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:async';
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 import '../animation/animation_performance.dart';
 import '../painting/box_painter.dart';
 import '../theme/colors.dart';
 import '../theme/shadows.dart';
 import 'animated_component.dart';
 import 'basic.dart';
 import 'popup_menu_item.dart';
+import 'scrollable_viewport.dart';
 
 const Duration _kMenuOpenDuration = const Duration(milliseconds: 300);
 const Duration _kMenuCloseDuration = const Duration(milliseconds: 200);
 const Duration _kMenuCloseDelay = const Duration(milliseconds: 100);
 const double _kMenuWidthStep = 56.0;
 const double _kMenuMargin = 16.0; // 24.0 on tablet
 const double _kMenuMinWidth = 2.0 * _kMenuWidthStep;
 const double _kMenuMaxWidth = 5.0 * _kMenuWidthStep;
 const double _kMenuHorizontalPadding = 16.0;
 const double _kMenuVerticalPadding = 8.0;
@@ skipping 113 matching lines @@
             double height = math.min(size.height, size.height * controller.position.value * 1.5);
             _painter.paint(canvas, new Rect.fromLTRB(size.width - width, 0.0, width, height));
           },
           child: new ConstrainedBox(
             constraints: new BoxConstraints(
               minWidth: _kMenuMinWidth,
               maxWidth: _kMenuMaxWidth
             ),
             child: new ShrinkWrapWidth(
               stepWidth: _kMenuWidthStep,
-              child: new Container(
-                padding: const EdgeDims.symmetric(
-                  horizontal: _kMenuHorizontalPadding,
-                  vertical: _kMenuVerticalPadding
-                ),
-                child: new Block(children)
+              child: new ScrollableViewport(
+                child: new Container(
+                  padding: const EdgeDims.symmetric(
+                    horizontal: _kMenuHorizontalPadding,
+                    vertical: _kMenuVerticalPadding
+                  ),
+                  child: new Block(children)
+                )
               )
             )
           )
         )
       )
     );
   }
 
 }