Move tools to tool folder.

pkg/front_end/test/src/base/processed_options_test.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/compiler_options.dart';
 import 'package:front_end/memory_file_system.dart';
 import 'package:front_end/src/base/processed_options.dart';
 import 'package:front_end/src/fasta/compiler_context.dart';
-import 'package:front_end/src/fasta/fasta.dart' show ByteSink;
+import 'package:front_end/src/fasta/util/bytes_sink.dart' show BytesSink;
 import 'package:front_end/src/fasta/fasta_codes.dart';
 import 'package:kernel/binary/ast_to_binary.dart' show BinaryPrinter;
 import 'package:kernel/kernel.dart'
     show CanonicalName, Library, Program, loadProgramFromBytes;
 import 'package:package_config/packages.dart' show Packages;
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 main() {
   CompilerContext.runWithDefaultOptions((_) {
@@ skipping 64 matching lines @@
 
   test_getSdkSummary_summaryLocationProvided() async {
     var uri = Uri.parse('file:///sdkSummary');
     writeMockSummaryTo(uri);
     checkMockSummary(new CompilerOptions()
       ..fileSystem = fileSystem
       ..sdkSummary = uri);
   }
 
   void writeMockSummaryTo(Uri uri) {
-    var sink = new ByteSink();
+    var sink = new BytesSink();
     new BinaryPrinter(sink).writeProgramFile(mockSummary);
     fileSystem.entityForUri(uri).writeAsBytesSync(sink.builder.takeBytes());
   }
 
   Future<Null> checkMockSummary(CompilerOptions raw) async {
     var processed = new ProcessedOptions(raw);
     var sdkSummary = await processed.loadSdkSummary(new CanonicalName.root());
     expect(sdkSummary.libraries.single.importUri,
         mockSummary.libraries.single.importUri);
   }
@@ skipping 357 matching lines @@
     var index = messageTemplate.indexOf('#');
     var prefix = messageTemplate.substring(0, index - 1);
 
     // Check that the prefix is not empty and that it contains more than one
     // word.
     expect(prefix.length > 0, isTrue);
     expect(prefix.contains(' '), isTrue);
     return prefix;
   }
 }