dart2js.

sdk/lib/_internal/lib/isolate_patch.dart

Index: sdk/lib/_internal/lib/isolate_patch.dart
diff --git a/sdk/lib/_internal/lib/isolate_patch.dart b/sdk/lib/_internal/lib/isolate_patch.dart
index 8ad378569618eb3dd922e5f140e5eb57a35d47bb..b1dd542db17a8592eec3cf562b2bacb20e56a32a 100644
--- a/sdk/lib/_internal/lib/isolate_patch.dart
+++ b/sdk/lib/_internal/lib/isolate_patch.dart
@@ -12,35 +12,23 @@ import 'dart:_isolate_helper' show IsolateNatives,
 
 patch class Isolate {
   patch static Future<Isolate> spawn(void entryPoint(message), var message) {
-    throw new UnimplementedError("spawn");
+    SendPort controlPort = IsolateNatives.spawnFunction(entryPoint, message);
+    return new Future<Isolate>.value(new Isolate._fromControlPort(controlPort));
   }
 
   patch static Future<Isolate> spawnUri(
       Uri uri, List<String> args, var message) {
-    throw new UnimplementedError("spawn uri");
-  }
-}
-
-class _Isolate {
-  static ReceivePort get port {
-    if (lazyPort == null) {
-      lazyPort = new ReceivePort();
+    if (args is List<String>) {
+      for (int i = 0; i < args.length; i++) {
+        if (args[i] is! String) {
+          throw new ArgumentError("Args must be a list of Strings $args");
+        }
+      }
+    } else if (args != null) {
+      throw new ArgumentError("Args must be a list of Strings $args");
     }
-    return lazyPort;
-  }
-
-  static SendPort _spawnFunction(void topLevelFunction(),
-      [bool unhandledExceptionCallback(IsolateUnhandledException e)]) {
-    if (unhandledExceptionCallback != null) {
-      // TODO(9012): Implement the UnhandledExceptionCallback.
-      throw new UnimplementedError(
-          "spawnFunction with unhandledExceptionCallback");
-    }
-    return IsolateNatives.spawnFunction(topLevelFunction);
-  }
-
-  static SendPort _spawnUri(String uri) {
-    return IsolateNatives.spawn(null, uri, false);
+    SendPort controlPort = IsolateNatives.spawn(uri, args, message);
+    return new Future<Isolate>.value(new Isolate._fromControlPort(controlPort));
   }
 }
 
@@ -59,4 +47,4 @@ patch class RawReceivePort {
   patch factory RawReceivePort([void handler(event)]) {
     throw new UnimplementedError("RawReceivePort");
   }
-}
+}