A smaller step this time - change only clients, but keep implementation
the same for now.
Not all patched SDKs have all classes and procedures, so I have to make
some them lazy. All of them could be done for consistency, but this
might slightly affect performance for often used dart:core classes.
Also it's a bit of mess now.
Maybe group these classes into logical structures, coreTypes.core.list,
coreTypes.async.future, coreTypes.async.futureMicrotask, etc. Something
like it was before this change, but fixed types and names instead of
more flexible (but in general slower) strings.
R=ahe@google.com, kmillikin@google.com, paulberry@google.com, sigmund@google.com
BUG=
Review-Url: https://codereview.chromium.org/2890933002 .
Konstantin Shcheglov
77d4eb609b