Support globals in frog isolates.

frog/corejs.dart

Index: frog/corejs.dart
diff --git a/frog/corejs.dart b/frog/corejs.dart
index 3a1df8e7551acbf73a4465a68a9745035b195d72..7a0deddff049150f35fcefc27122373a46b7a988 100644
--- a/frog/corejs.dart
+++ b/frog/corejs.dart
@@ -395,10 +395,10 @@ Array.prototype.$setindex = function(i, value) { return this[i] = value; }""");
 // 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 isolate = $globalState.currentIsolate;
+  var isolateContext = $globalState.currentContext;
   var self = this;
   this.wrap$0 = function() {
-    isolate.eval(self);
+    isolateContext.eval(self);
     $globalState.topEventLoop.run();
   };
   this.wrap$call$0 = function() { return this.wrap$0; };
@@ -410,10 +410,10 @@ Function.prototype.wrap$call$0 = function() {
 // 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 isolate = $globalState.currentIsolate;
+  var isolateContext = $globalState.currentContext;
   var self = this;
   this.wrap$1 = function(arg) {
-    isolate.eval(function() { self(arg); });
+    isolateContext.eval(function() { self(arg); });
     $globalState.topEventLoop.run();
   };
   this.wrap$call$1 = function() { return this.wrap$1; };
@@ -422,6 +422,7 @@ Function.prototype.wrap$call$1 = function() {
       }
       w.writeln(@"""
 var $globalThis = this;
+var $globals = null;
 var $globalState = null;""");
     } else {
       if (useWrap0) {