Move all main methods to tool/.

pkg/front_end/tool/fasta/log_analyzer.dart

 // Copyright (c) 2016, 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:convert' show JSON;
 
 import 'dart:io';
 
 import 'package:testing/src/run_tests.dart' show CommandLine;
 
@@ skipping 16 matching lines @@
         field = field.substring(5);
         sb.write(JSON.encode(data[field]));
       } else {
         sb.write(data[field]);
       }
       isFirst = false;
     }
     print("$sb");
   }
 }