Fine. More @trackedXyz annotations.

Change-Id: I9d5c8bb17b0783e921a281ce15b03cd422c045c7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/448255
Reviewed-by: Brian Wilkerson <[email protected]>
Reviewed-by: Johnni Winther <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov