Move some of analyzer's code generation utilities into front_end.

pkg/analysis_server/tool/spec/codegen_analysis_server.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.
 
 /**
  * Code generation for the file "AnalysisServer.java".
  */
 library java.generator.server;
 
 import 'package:analyzer/src/codegen/tools.dart';
+import 'package:front_end/src/codegen/tools.dart';
 
 import 'api.dart';
 import 'codegen_java.dart';
 
 final GeneratedFile target = javaGeneratedFile(
     'tool/spec/generated/java/AnalysisServer.java',
     (Api api) => new CodegenAnalysisServer(api));
 
 class CodegenAnalysisServer extends CodegenJavaVisitor {
   CodegenAnalysisServer(Api api) : super(api);
@@ skipping 105 matching lines @@
         }
       }
       if (request.result != null) {
         arguments.add('${consumerName(request)} consumer');
       }
       write(arguments.join(', '));
       writeln(');');
     });
   }
 }