Change integration test send...() methods to use structured objects.

pkg/analysis_server/test/integration/analysis/highlights_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.integration.analysis.highlights;
 
-import '../../reflective_tests.dart';
+import 'package:analysis_server/src/protocol.dart';
 import 'package:unittest/unittest.dart';
 
+import '../../reflective_tests.dart';
 import '../integration_tests.dart';
 
 @ReflectiveTestCase()
 class AnalysisHighlightsTest extends AbstractAnalysisServerIntegrationTest {
   test_highlights() {
     String pathname = sourcePath('test.dart');
     String text =
         r'''
 import 'dart:async' as async;
 
@@ skipping 39 matching lines @@
 function(dynamicType) {
   print('string');
   unresolvedIdentifier = 42;
   return async.Future.wait([]);
 }
 
 int topLevelVariable;
 ''';
     writeFile(pathname, text);
     standardAnalysisSetup();
-    sendAnalysisSetSubscriptions({'HIGHLIGHTS': [pathname]});
+    sendAnalysisSetSubscriptions({AnalysisService.HIGHLIGHTS: [pathname]});
     // Map from highlight type to highlighted text
     Map<String, Set<String>> highlights;
     onAnalysisHighlights.listen((params) {
       expect(params['file'], equals(pathname));
       highlights = <String, Set<String>>{};
       for (var region in params['regions']) {
         int startIndex = region['offset'];
         int endIndex = startIndex + region['length'];
         String highlightedText = text.substring(startIndex, endIndex);
         String type = region['type'];
@@ skipping 47 matching lines @@
       check('TYPE_NAME_DYNAMIC', ['dynamic']);
       check('TYPE_PARAMETER', ['TypeParameter']);
       expect(highlights, isEmpty);
     });
   }
 }
 
 main() {
   runReflectiveTests(AnalysisHighlightsTest);
 }