Introducing a lint server plugin.

pkg/analysis_server/lib/src/server/driver.dart

Index: pkg/analysis_server/lib/src/server/driver.dart
diff --git a/pkg/analysis_server/lib/src/server/driver.dart b/pkg/analysis_server/lib/src/server/driver.dart
index 1f5bd4b10b8a0b53f7fe05a217af65f0d0ff1501..698f63fe08428dc2209e068a16d9bf4000713df4 100644
--- a/pkg/analysis_server/lib/src/server/driver.dart
+++ b/pkg/analysis_server/lib/src/server/driver.dart
@@ -10,6 +10,7 @@ import 'dart:math';
 
 import 'package:analysis_server/plugin/analysis/resolver_provider.dart';
 import 'package:analysis_server/src/analysis_server.dart';
+import 'package:analysis_server/src/plugin/linter_plugin.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/server/http_server.dart';
 import 'package:analysis_server/src/server/stdio_server.dart';
@@ -25,7 +26,6 @@ import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/sdk_io.dart';
 import 'package:args/args.dart';
 import 'package:linter/src/plugin/linter_plugin.dart';
-import 'package:plugin/manager.dart';
 import 'package:plugin/plugin.dart';
 
 /**
@@ -407,6 +407,7 @@ class Driver implements ServerStarter {
     plugins.add(serverPlugin);
     plugins.addAll(_userDefinedPlugins);
     plugins.add(linterPlugin);
+    plugins.add(linterServerPlugin);
 
     // Defer to the extension manager in AE for plugin registration.
     AnalysisEngine.instance.userDefinedPlugins = plugins;