isolates refactor: this change introduces 'dart:isolate' as a library. This is a

lib/isolate/frog/natives.js

Index: lib/isolate/frog/natives.js
diff --git a/lib/isolate/frog/natives.js b/lib/isolate/frog/natives.js
new file mode 100644
index 0000000000000000000000000000000000000000..777255022ed5946876fb084cbf6f71cb1b03e38c
--- /dev/null
+++ b/lib/isolate/frog/natives.js
@@ -0,0 +1,37 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Top-level native code needed by the frog compiler
+
+var $globalThis = this;
+var $globals = null;
+var $globalState = null;
+
+// Wrap a 0-arg dom-callback to bind it with the current isolate:
+function $wrap_call$0(fn) { return fn && fn.wrap$call$0(); }
+
+Function.prototype.wrap$call$0 = function() {
+  var isolateContext = $globalState.currentContext;
+  var self = this;
+  this.wrap$0 = function() {
+    isolateContext.eval(self);
+    $globalState.topEventLoop.run();
+  };
+  this.wrap$call$0 = function() { return this.wrap$0; };
+  return this.wrap$0;
+};
+
+// Wrap a 1-arg dom-callback to bind it with the current isolate:
+function $wrap_call$1(fn) { return fn && fn.wrap$call$1(); }
+
+Function.prototype.wrap$call$1 = function() {
+  var isolateContext = $globalState.currentContext;
+  var self = this;
+  this.wrap$1 = function(arg) {
+    isolateContext.eval(function() { self(arg); });
+    $globalState.topEventLoop.run();
+  };
+  this.wrap$call$1 = function() { return this.wrap$1; };
+  return this.wrap$1;
+};