Deferred (aka lazy) loading of static functions.

dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart

Index: dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart b/dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
index 2c80eaa53140bf0741af00a07796497205109974..72d3f0aa59381eb3d5821d55d6e6ad11d4031c4e 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
@@ -522,6 +522,16 @@ class Primitives {
       ? JS('bool', '# == null', b)
       : JS('bool', '# === #', a, b);
   }
+
+  // Used to implement deferred loading. Used as callback on "load"

[ahe, 2013/02/04 17:46:29]

I should be able to move these methods into async_patch now that _foreign_helper
is imported explicitly.

[ahe, 2013/02/05 13:54:22]

Done.

+  // event by async_patch.dart.
+  static onDeferredLibraryLoadClosure(/* Completer<bool> */ completer, event) {
+    completer.complete(true);
+  }
+
+  static onDeferredLibraryLoad() {
+    return DART_CLOSURE_TO_JS(onDeferredLibraryLoadClosure);
+  }
 }
 
 /**