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

pkg/analysis_server/test/domain_analysis_test.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 test.domain.analysis;
 
 import 'dart:async';
 
+import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
-import 'package:analysis_server/src/computers.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/resource.dart';
 import 'package:unittest/unittest.dart';
 
 import 'mocks.dart';
 
 
 main() {
   groupSep = ' | ';
@@ skipping 1610 matching lines @@
       // subscribe
       helper.addAnalysisSubscriptionHighlights(helper.testFile);
       // wait, has regions
       return helper.waitForOperationsFinished().then((_) {
         var highlights = helper.getHighlights(helper.testFile);
         expect(highlights, isNot(isEmpty));
       });
     });
   });
 }