Cache the context proxy. Don't use window for global 'this'.

sdk/lib/_internal/lib/js_helper.dart

Index: sdk/lib/_internal/lib/js_helper.dart
diff --git a/sdk/lib/_internal/lib/js_helper.dart b/sdk/lib/_internal/lib/js_helper.dart
index ddeb666771caa7e66c829eeb757321952dcc4120..968f2d881934791ee53cc51b1be0dbc34269ad6e 100644
--- a/sdk/lib/_internal/lib/js_helper.dart
+++ b/sdk/lib/_internal/lib/js_helper.dart
@@ -67,6 +67,8 @@ String S(value) {
   return res;
 }
 
+computeGlobalThis() => JS('', 'function() { return this; }()');

[ahe, 2013/10/02 10:19:55]

Move to class Primitives.

[justinfagnani, 2013/10/02 20:38:21]

Done.

+
 createInvocationMirror(String name, internalName, kind, arguments,
                        argumentNames) {
   return new JSInvocationMirror(name,