fixes#138, extension methods for Iterable/List injected as needed, regardless of how the methods started
fixes#142, extension methods and dynamic dispatch
small change that fixes#139, recognize that '.length' doesn't need an extension method
Also restores JSArray, moved the methods out of List, which is back to just being an interface.
NOTE: this removes the capability of types that mix native JS members and some Dart extension members, instead it now *hides* all JS members for these native types. We'll want to bring that feature back to support dart:html, so it's just a simplification for now. Should be easy to add that capability when we pull in dart:html for reals.
R=leafp@google.com, vsm@google.com
Review URL: https://codereview.chromium.org/1153003003
Factored the load order logic into its own file, as it was easier to work with that way. We could definitely tweak the structure.
Also tried hoisting constants out to top level, but it's not quite ready yet, so splitting that work out into a separate CL.
(also fixes#152 about cleaning up lazyClass, and fixes#181 about static fields)
R=vsm@google.com
Review URL: https://codereview.chromium.org/1133593004
Leaf Petersen