The patch library is loaded normally, and then non-patch methods and classes
are cloned and added to the patched library. To support methods from other
compilation units, all elements now has a scriptOverride field that lets
them report a different script than the one of their enclosing element.
(For top-level elements that's already possible, as that's what #source does,
but for fields inside a class, we can't easily wrap a compilation unit element
around them.)
TBR: floitsch
(to get in before vacation, with reversion rights).
Review URL: https://chromiumcodereview.appspot.com//10703188
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@9629 260f80e4-7a28-3924-810f-c04153c831b5
lrn@google.com