Add support for specifying files needing analysis

pkg/analysis_server/lib/src/socket_server.dart

Index: pkg/analysis_server/lib/src/socket_server.dart
diff --git a/pkg/analysis_server/lib/src/socket_server.dart b/pkg/analysis_server/lib/src/socket_server.dart
index 8fb9b8d24470d37ccc55748ef4e9c2153ebacf35..28e08cef8de0dc60e224219f0a11db41f337243e 100644
--- a/pkg/analysis_server/lib/src/socket_server.dart
+++ b/pkg/analysis_server/lib/src/socket_server.dart
@@ -75,17 +75,9 @@ class SocketServer {
     }
 
     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);
-  }
 }