Exit stdio-based analysis server when stdin closed.

pkg/analysis_server/lib/http_server.dart

Index: pkg/analysis_server/lib/http_server.dart
diff --git a/pkg/analysis_server/lib/http_server.dart b/pkg/analysis_server/lib/http_server.dart
index 752e77573e56e9e0a5ba09f38012c11217d04708..af63b70ccd725b05afc64eda9b219dc98a8625e8 100644
--- a/pkg/analysis_server/lib/http_server.dart
+++ b/pkg/analysis_server/lib/http_server.dart
@@ -4,6 +4,7 @@
 
 library http.server;
 
+import 'dart:async';
 import 'dart:io';
 
 import 'package:analysis_server/src/channel.dart';
@@ -33,6 +34,11 @@ class HttpAnalysisServer {
   HttpAnalysisServer(this.socketServer);
 
   /**
+   * Future that is completed with the HTTP server once it is running.
+   */
+  Future<HttpServer> _server;
+
+  /**
    * Attach a listener to a newly created HTTP server.
    */
   void _handleServer(HttpServer httServer) {
@@ -84,6 +90,13 @@ class HttpAnalysisServer {
    * Begin serving HTTP requests over the given port.
    */
   void serveHttp(int port) {
-    HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, port).then(_handleServer);
+    _server = HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, port);
+    _server.then(_handleServer);
+  }
+
+  void close() {
+    _server.then((HttpServer server) {
+      server.close();
+    });
   }
 }