Move function serialization to sync ports.

client/dart.js

Index: client/dart.js
diff --git a/client/dart.js b/client/dart.js
index c070ef1a68a6a2b33e92e7a8c3bdce55008e9104..dae0d2b61482a36eab12c9112a360af5b25a45c9 100644
--- a/client/dart.js
+++ b/client/dart.js
@@ -108,6 +108,7 @@ function ReceivePortSync() {
       case 'map': return deserializeMap(x);
       case 'sendport': return deserializeSendPort(x);
       case 'list': return deserializeList(x);
+      case 'funcref': return deserializeFunction(x);
       default: throw 'unimplemented';
     }
   }
@@ -150,6 +151,14 @@ function ReceivePortSync() {
     return result;
   }
 
+  function deserializeFunction(x) {
+    var ref = x[1];
+    var sendPort = deserializeSendPort(x[2]);
+    // Number of arguments is not used as of now
+    // we cannot find it out for Dart function in pure Dart.
+    return _makeFunctionFromRef(ref, sendPort);
+  }
+
   window.registerPort = function(name, port) {
     var stringified = JSON.stringify(serialize(port));
     window.localStorage['dart-port:' + name] = stringified;
@@ -233,4 +242,12 @@ function ReceivePortSync() {
     window.removeEventListener(source, listener, false);
     return deserialize(result);
   }
+
+  // Leaking implementation.
+  // TODO: provide proper, backend-specific implementation.
+  function _makeFunctionFromRef(ref, sendPort) {
+    return function() {
+      return sendPort.callSync([ref, Array.prototype.slice.call(arguments)]);
+    }
+  }
 })();