c058785219
This subcommand uses perf_witness recording functionality to record performance timelines of all processes that opted into the recording. Change-Id: I37fd9fc88e38853a77a105370e2020fc6a6a6964 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/459745 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Slava Egorov <vegorov@google.com>