Split computers.dart and use parsed JSON objects for navigation tests.

pkg/analysis_server/lib/src/operation/operation_analysis.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 operation.analysis;
 
 import 'package:analysis_server/src/operation/operation.dart';
 import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analysis_server/src/computers.dart';
+import 'package:analysis_server/src/computer/computer_highlights.dart';
+import 'package:analysis_server/src/computer/computer_navigation.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 
 /**
@@ skipping 100 matching lines @@
     'errorCode': '${errorCode.runtimeType}.${(errorCode as Enum).name}',
     'offset': analysisError.offset,
     'length': analysisError.length,
     'message': analysisError.message
   };
   if (analysisError.correction != null) {
     result['correction'] = analysisError.correction;
   }
   return result;
 }