Update mojo sdk to rev cb6c5abfadfea0ca73dca466e2894554ac1ae144

third_party/mojo/src/mojo/public/dart/src/proxy.dart

Index: third_party/mojo/src/mojo/public/dart/src/proxy.dart
diff --git a/third_party/mojo/src/mojo/public/dart/src/proxy.dart b/third_party/mojo/src/mojo/public/dart/src/proxy.dart
index 5317e5648b558843fb533c2e90c1b1f66083dccf..a84ca3ec0c23726726e432aa7f8e111552c27f25 100644
--- a/third_party/mojo/src/mojo/public/dart/src/proxy.dart
+++ b/third_party/mojo/src/mojo/public/dart/src/proxy.dart
@@ -4,6 +4,12 @@
 
 part of bindings;
 
+class ProxyCloseException {
+  final String message;
+  ProxyCloseException(this.message);
+  String toString() => message;
+}
+
 abstract class Proxy extends core.MojoEventStreamListener {
   Map<int, Completer> _completerMap;
   int _nextId = 0;
@@ -40,6 +46,15 @@ abstract class Proxy extends core.MojoEventStreamListener {
     throw 'Unexpected write signal in proxy.';
   }
 
+  @override
+  Future close({bool nodefer: false}) {
+    for (var completer in _completerMap.values) {
+      completer.completeError(new ProxyCloseException('Proxy closed'));
+    }
+    _completerMap.clear();
+    return super.close(nodefer: nodefer);
+  }
+
   void sendMessage(Struct message, int name) {
     if (!isOpen) {
       listen();