Catch exceptions in ByteStreamServerChannel._outputLine() and close the channel.

pkg/analysis_server/lib/src/channel/byte_stream_channel.dart

Index: pkg/analysis_server/lib/src/channel/byte_stream_channel.dart
diff --git a/pkg/analysis_server/lib/src/channel/byte_stream_channel.dart b/pkg/analysis_server/lib/src/channel/byte_stream_channel.dart
index b7747cc2ae6b7a2199c739c2e1363994d91df0cb..dce7e5912e154457ae9aa2e9ffb0cae973fb3399 100644
--- a/pkg/analysis_server/lib/src/channel/byte_stream_channel.dart
+++ b/pkg/analysis_server/lib/src/channel/byte_stream_channel.dart
@@ -144,7 +144,11 @@ class ByteStreamServerChannel implements ServerCommunicationChannel {
    * Send the string [s] to [_output] followed by a newline.
    */
   void _outputLine(String s) {
-    _output.writeln(s);
+    runZoned(() {
+      _output.writeln(s);
+    }, onError: (e) {
+      close();
+    });
   }
 
   /**