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TEST=Loaded the response from a getPerfettoVMTimeline request in the Perfetto trace viewer and made sure everything looked correct. Change-Id: I8d4bc35fb36601701976c28653db92b2161e4724 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/288066 Commit-Queue: Derek Xu <derekx@google.com> Reviewed-by: Ben Konyi <bkonyi@google.com>