Eliminate dependencies on pkg/front_end.

pkg/analyzer/lib/src/codegen/tools.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Tools for generating code in analyzer and analysis server.
  */
 library analyzer.src.codegen.tools;
 
 import 'package:analyzer/src/codegen/html.dart';
 import 'package:analyzer/src/codegen/text_formatter.dart';
 import 'package:html/dom.dart' as dom;
+export 'package:front_end/src/codegen/tools.dart';

[Siggi Cherem (dart-lang), 2017/08/07 16:57:10]

it seems like this file is not used anymore in pacakge:front_end, maybe it is
worth moving that code back here?

[Paul Berry, 2017/08/07 17:04:33]

Maybe.  I'd like to wait until we see how kernel's use of flatbuffers pans out
first.

 
 final RegExp trailingSpacesInLineRegExp = new RegExp(r' +$', multiLine: true);
 final RegExp trailingWhitespaceRegExp = new RegExp(r'[\n ]+$');
 
 /**
  * Join the given strings using camelCase.  If [doCapitalize] is true, the first
  * part will be capitalized as well.
  */
 String camelJoin(List<String> parts, {bool doCapitalize: false}) {
   List<String> upcasedParts = <String>[];
@@ skipping 360 matching lines @@
     if (lines.last.isEmpty) {
       lines.removeLast();
       buffer.add(new dom.Text(lines.join('\n$indent') + '\n'));
       indentNeeded = true;
     } else {
       buffer.add(new dom.Text(lines.join('\n$indent')));
       indentNeeded = false;
     }
   }
 }