Add support for specifying files needing analysis

pkg/analysis_server/lib/src/socket_server.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 socket.server;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/channel/channel.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/protocol.dart';
@@ skipping 57 matching lines @@
           'File read mode was set to the unknown mode: $analysisServerOptions.fileReadMode');
     }
 
     Index index = null;
     if (!analysisServerOptions.noIndex) {
       index = createLocalFileIndex();
       index.run();
     }
 
     analysisServer = new AnalysisServer(serverChannel, resourceProvider,
-        new OptimizingPubPackageMapProvider(resourceProvider, defaultSdk), index,
-        analysisServerOptions, defaultSdk, instrumentationService,
-        rethrowExceptions: false);
-    _initializeHandlers(analysisServer);
+        new OptimizingPubPackageMapProvider(resourceProvider, defaultSdk),
+        index, serverPlugin, analysisServerOptions, defaultSdk,
+        instrumentationService, rethrowExceptions: false);
     analysisServer.userDefinedPlugins = userDefinedPlugins;
   }
-
-  /**
-   * Initialize the handlers to be used by the given [server].
-   */
-  void _initializeHandlers(AnalysisServer server) {
-    server.handlers = serverPlugin.createDomains(server);
-  }
 }