Enhance dart:js interop in a backwards compatible manner. List objects can now be passed back and f…

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 5ab6241ee4e47d93cb7c2ca1fae7ac7e4579d59b..b5786609ebc66a82b7c2b197a8e5ab30ed7fdb69 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -120,9 +120,9 @@ final htmlBlinkMap = {
   '_DOMWindowCrossFrame': () => _DOMWindowCrossFrame,
   // FIXME: Move these to better locations.
   'DateTime': () => DateTime,
-  'JsObject': () => js.JsObject,
-  'JsFunction': () => js.JsFunction,
-  'JsArray': () => js.JsArray,
+  'JsObject': () => js.JsObjectImpl,

[Jacob, 2015/06/18 22:22:24]

These impl classes are now lazily created as required.
We can't lazily create the JsObject, JsArray, and JsFunction classes as they
could be referenced in user code.

+  'JsFunction': () => js.JsFunctionImpl,
+  'JsArray': () => js.JsArrayImpl,
   'AbstractWorker': () => AbstractWorker,
   'Animation': () => Animation,
   'AnimationEffect': () => AnimationEffect,