Use a more precise type for "object" in analysis server API.

pkg/analysis_server/tool/spec/codegen_dart_protocol.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.
 
 library codegen.protocol;
 
 import 'dart:convert';
 
 import 'api.dart';
 import 'codegen_tools.dart';
@@ skipping 172 matching lines @@
 typedef void CodegenCallback();
 
 /**
  * Visitor which produces Dart code representing the API.
  */
 class CodegenProtocolVisitor extends HierarchicalApiVisitor with CodeGenerator {
   /**
    * Type references in the spec that are named something else in Dart.
    */
   static const Map<String, String> _typeRenames = const {
-    'object': 'Object',
+    'object': 'Map',
   };
 
   /**
    * Class members for which the constructor argument should be optional, even
    * if the member is not an optional part of the protocol.  For list types,
    * the constructor will default the member to the empty list.
    */
   static const Map<String, List<String>> _optionalConstructorArguments = const {
     'ErrorFixes': const ['fixes'],
     'SourceChange': const ['edits', 'linkedEditGroups'],
@@ skipping 80 matching lines @@
   void emitObjectClass(String className, TypeObject type,
       ImpliedType impliedType) {
     docComment(toHtmlVisitor.collectHtml(() {
       toHtmlVisitor.p(() {
         toHtmlVisitor.write(impliedType.humanReadableName);
       });
       if (impliedType.type != null) {
         toHtmlVisitor.showType(null, impliedType.type);
       }
     }));
-    writeln('class $className {');
+    writeln('class $className implements HasToJson {');
     indent(() {
       if (emitSpecialStaticMembers(className)) {
         writeln();
       }
       for (TypeObjectField field in type.fields) {
         if (field.value != null) {
           continue;
         }
         docComment(toHtmlVisitor.collectHtml(() {
           toHtmlVisitor.translateHtml(field.html);
@@ skipping 961 matching lines @@
   CodegenProtocolVisitor visitor = new CodegenProtocolVisitor(readApi());
   return visitor.collectCode(visitor.visitApi);
 });
 
 /**
  * Translate spec_input.html into protocol_matchers.dart.
  */
 main() {
   target.generate();
 }