Move tools to tool folder.

pkg/front_end/lib/src/base/processed_options.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 
 import 'package:front_end/compilation_message.dart';
 import 'package:front_end/compiler_options.dart';
 import 'package:front_end/file_system.dart';
 import 'package:front_end/src/base/performace_logger.dart';
@@ skipping 544 matching lines @@
 
     sb.writeln('Compile SDK: ${compileSdk}');
     sb.writeln('SDK root: ${_sdkRoot} (provided: ${_raw.sdkRoot})');
     sb.writeln('SDK specification: ${_librariesSpecificationUri} '
         '(provided: ${_raw.librariesSpecificationUri})');
     sb.writeln('SDK summary: ${_sdkSummary} (provided: ${_raw.sdkSummary})');
 
     sb.writeln('Strong: ${strongMode}');
     sb.writeln('Target: ${_target?.name} (provided: ${_raw.target?.name})');
 
-    sb.writeln('throwOnErrorsAreFatal: ${throwOnErrors}');
+    sb.writeln('throwOnErrors: ${throwOnErrors}');
     sb.writeln('throwOnWarningsAreFatal: ${throwOnWarnings}');

[Siggi Cherem (dart-lang), 2017/08/23 20:17:34]

while you are here, let's remove AreFatal on this one too

[ahe, 2017/08/24 11:52:01]

Done.

     sb.writeln('throwOnNits: ${throwOnNits}');
     sb.writeln('exit on problem: ${setExitCodeOnProblem}');
     sb.writeln('Embed sources: ${embedSourceText}');
     sb.writeln('debugDump: ${debugDump}');
     sb.writeln('verbose: ${verbose}');
     sb.writeln('verify: ${verify}');
     return '$sb';
   }
 }
 
@@ skipping 37 matching lines @@
   String get dart2jsCode => _original.code.dart2jsCode;
 
   SourceSpan get span =>
       new SourceLocation(_original.charOffset, sourceUrl: _original.uri)
           .pointSpan();
 
   _CompilationMessage(this._original, this.severity);
 
   String toString() => message;
 }