Capture the request time for performance data and support forced shutdown

pkg/analyzer_plugin/lib/src/channel/isolate_channel.dart

Index: pkg/analyzer_plugin/lib/src/channel/isolate_channel.dart
diff --git a/pkg/analyzer_plugin/lib/src/channel/isolate_channel.dart b/pkg/analyzer_plugin/lib/src/channel/isolate_channel.dart
index 65c33cd445686076c75834359a46c507df3d7f23..e712d08b25d380eb81ed219ccd7b6bcbcdff9ee7 100644
--- a/pkg/analyzer_plugin/lib/src/channel/isolate_channel.dart
+++ b/pkg/analyzer_plugin/lib/src/channel/isolate_channel.dart
@@ -223,6 +223,11 @@ abstract class ServerIsolateChannel implements ServerCommunicationChannel {
   }
 
   @override
+  void kill() {
+    _isolate.kill(priority: Isolate.IMMEDIATE);
+  }
+
+  @override
   Future<Null> listen(void onResponse(Response response),
       void onNotification(Notification notification),
       {Function onError, void onDone()}) async {