Add requestTime to responses

pkg/analyzer_plugin/tool/spec/codegen_protocol_common.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 'package:analyzer/src/codegen/tools.dart';
 import 'package:front_end/src/codegen/tools.dart';
 import 'package:path/path.dart' as path;
 
 import 'api.dart';
 import 'codegen_dart_protocol.dart';
 import 'from_html.dart';
 import 'implied_types.dart';
 
-final GeneratedFile target =
+GeneratedFile target(bool responseRequiresRequestTime) =>
     new GeneratedFile('lib/protocol/protocol_common.dart', (String pkgPath) {
-  CodegenCommonVisitor visitor =
-      new CodegenCommonVisitor(path.basename(pkgPath), readApi(pkgPath));
-  return visitor.collectCode(visitor.visitApi);
-});
+      CodegenCommonVisitor visitor = new CodegenCommonVisitor(
+          path.basename(pkgPath),
+          responseRequiresRequestTime,
+          readApi(pkgPath));
+      return visitor.collectCode(visitor.visitApi);
+    });
 
 /**
  * A visitor that produces Dart code defining the common types associated with
  * the API.
  */
 class CodegenCommonVisitor extends CodegenProtocolVisitor {
   /**
    * Initialize a newly created visitor to generate code in the package with the
    * given [packageName] corresponding to the types in the given [api] that are
    * common to multiple protocols.
    */
-  CodegenCommonVisitor(String packageName, Api api) : super(packageName, api);
+  CodegenCommonVisitor(
+      String packageName, bool responseRequiresRequestTime, Api api)
+      : super(packageName, responseRequiresRequestTime, api);
 
   @override
   void emitImports() {
     writeln("import 'dart:convert' hide JsonDecoder;");
     writeln();
     writeln("import 'package:analyzer/src/generated/utilities_general.dart';");
     writeln("import 'package:$packageName/protocol/protocol.dart';");
     writeln(
         "import 'package:$packageName/src/protocol/protocol_internal.dart';");
   }
 
   @override
   List<ImpliedType> getClassesToEmit() {
     List<ImpliedType> types = impliedTypes.values.where((ImpliedType type) {
       ApiNode node = type.apiNode;
       return node is TypeDefinition && node.isExternal;
     }).toList();
     types.sort((first, second) =>
         capitalize(first.camelName).compareTo(capitalize(second.camelName)));
     return types;
   }
 }