Main changes:
1. Separating `FragmentBuilder` and `ElementBuilder`. I removed
`augmentation.dart` and its builders, because now it is implemented in
the new `ElementBuilder`.
2. Fragments are not given actual `Reference` objects anymore, there
might be some in the current state, but I will go over this in the
future and remove them completely.
3. Writing and reading elements also happens in two stages: first
fragments, then elements. Each fragment in the summary is given unique
ID, and during writing / reading elements we use these ID to locate
fragments and create elements around them.
4. Lazy loading of `ClassElement` members is simplified and generalized,
could be potentially applied to any `InstanceElement`. Maybe use also in
mixins, which are used somewhat often in Flutter.
5. There are slight changes to tests, mostly to the better, sometime a
bit reordering, a couple of new tests.
There is some dirty code added, especially around patching types for
getters, setters, and their fragments. I plan to clean this in future
CLs as I move toward better implementation, and from using fragments
where this is wrong.
Change-Id: I1e4bf2a3b7ff45f1dba133797e85cd70aa729c11
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/433180
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Konstantin Shcheglov
c0bca2c210