anchor.diff:  
     @override
     Widget build(BuildContext context) {
  +    ThemeData themeData = Theme.of(context);
  +    TextStyle aboutTextStyle = themeData.textTheme.body2;
  +    TextStyle aboutLinkStyle = themeData.textTheme.body2.copyWith(color: themeData.accentColor);
  +
       return new Drawer(
         child: new Block(
           children: <Widget>[
  
positive.code: // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  import 'package:flutter/material.dart';
  
  class GalleryDrawer extends StatelessWidget {
    GalleryDrawer({
  
negative.code:             applicationLegalese: '© 2016 The Chromium Authors',
              aboutBoxChildren: <Widget>[
                new Padding(
                  padding: const EdgeInsets.only(top: 24.0),
                  child: new RichText(
                    text: new TextSpan(
                      children: <TextSpan>[
                        new TextSpan(
                          style: aboutTextStyle,
                          text: "Flutter is an early-stage, open-source project to help "
                          "developers build high-performance, high-fidelity, mobile "
                          "apps for iOS and Android from a single codebase. This "
                          "gallery is a preview of Flutter's many widgets, behaviors, "
                          "animations, layouts, and more. Learn more about Flutter at "
                        ),
                        new LinkTextSpan(
                          style: aboutLinkStyle,
                          url: 'https://flutter.io'
                        ),
                        new TextSpan(
                          style: aboutTextStyle,
                          text: ".\n\nTo see the source code for this app, please visit the "
                        ),
                        new LinkTextSpan(
                          style: aboutLinkStyle,
                          url: 'https://goo.gl/iv1p4G',
                          text: 'flutter github repo'
                        ),
                        new TextSpan(
                          style: aboutTextStyle,
                          text: "."
                        )
                      ]
                    )
                  )
                )
              ]
            )
          ]
        )
      );
  