Introducing phased profiling framework.
TrackingSynchronizer can send a "phase completed" message to all processes. Their ThreadData's make a snapshot of task deaths and store it in a static map, associating with the number of the completed phase. They also clean the death data.
When requested to return a tasks snapshot, ThreadData returns that saved map, adding a snapshot of current task deaths as a separate "current" phase.
The rest of code was transformed to work with the map of snapshots instead of a single snapshot.
BUG=456354
Review URL: https://codereview.chromium.org/985773002
Cr-Commit-Position: refs/heads/master@{#323151}
CrOS-Libchrome-Original-Commit: 379d7fe794b4a200e08ac3f23c69184edef085f7
3 files changed