Send re-analyze requests to plugins

pkg/analysis_server/lib/src/plugin/plugin_manager.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:io' show Platform;
 
 import 'package:analysis_server/src/plugin/notification_manager.dart';
 import 'package:analyzer/context/context_root.dart' as analyzer;
@@ skipping 233 matching lines @@
       }
     }
   }
 
   /**
    * Broadcast a request built from the given [params] to all of the plugins
    * that are currently associated with the given [contextRoot]. Return a list
    * containing futures that will complete when each of the plugins have sent a
    * response.
    */
-  Map<PluginInfo, Future<Response>> broadcastRequest(
-      analyzer.ContextRoot contextRoot, RequestParams params) {
+  Map<PluginInfo, Future<Response>> broadcastRequest(RequestParams params,
+      {analyzer.ContextRoot contextRoot}) {
     List<PluginInfo> plugins = pluginsForContextRoot(contextRoot);
     Map<PluginInfo, Future<Response>> responseMap =
         <PluginInfo, Future<Response>>{};
     for (PluginInfo plugin in plugins) {
       responseMap[plugin] = plugin.currentSession?.sendRequest(params);
     }
     return responseMap;
   }
 
   /**
@@ skipping 27 matching lines @@
     }
     return responses;
   }
 
   /**
    * Return a list of all of the plugins that are currently associated with the
    * given [contextRoot].
    */
   @visibleForTesting
   List<PluginInfo> pluginsForContextRoot(analyzer.ContextRoot contextRoot) {
+    if (contextRoot == null) {
+      return _pluginMap.values.toList();
+    }
     List<PluginInfo> plugins = <PluginInfo>[];
     for (PluginInfo plugin in _pluginMap.values) {
       if (plugin.contextRoots.contains(contextRoot)) {
         plugins.add(plugin);
       }
     }
     return plugins;
   }
 
   /**
@@ skipping 350 matching lines @@
   Future<Null> stop() {
     if (channel == null) {
       throw new StateError('Cannot stop a plugin that is not running.');
     }
     // TODO(brianwilkerson) Ensure that the isolate is killed if it does not
     // terminate normally.
     sendRequest(new PluginShutdownParams());
     return pluginStoppedCompleter.future;
   }
 }