Send re-analyze requests to plugins

pkg/analysis_server/test/analysis/reanalyze_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.analysis.reanalyze;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:test/test.dart';
@@ skipping 54 matching lines @@
     await waitForTasksFinished();
     // The file should have been reanalyzed.
     expect(filesErrors, contains(testFile));
     // Verify that the syntax error is present (this indicates that the
     // content introduced by the call to updateContent is still in effect).
     {
       List<AnalysisError> errors = filesErrors[testFile];
       expect(errors, hasLength(1));
     }
   }
+
+  test_sentToPlugins() async {
+    createProject();
+    await waitForTasksFinished();
+    Request request = new Request("0", ANALYSIS_REANALYZE);
+    handleSuccessfulRequest(request);
+    // verify
+    expect(pluginManager.broadcastedRequest, isNotNull);
+  }
 }