da971bbf13
TEST=Checked that the timeline in DevTools still looked correct, and checked that no assertions failed when fetching the timeline Change-Id: Ia7ed4b8faf4e7c9e8871ecca3111a82e7f298318 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/300420 Reviewed-by: Ben Konyi <bkonyi@google.com> Reviewed-by: Siva Annamalai <asiva@google.com>