Use ThreadChecker in HistogramDeltaSerialization class.
There's a suspicion that this code might be being used from multiple threads. Add a ThreadChecker to make sure this isn't happening.
NOTE: These checks will still only be active in debug builds, but if they pass all the bots (that do run with dchecks on) and for developer builds, then I think it's pretty safe to assume there's no issue here. But good to have the precaution.
BUG=554011
Review URL: https://codereview.chromium.org/1463013002
Cr-Commit-Position: refs/heads/master@{#360689}
CrOS-Libchrome-Original-Commit: 0b6761ff0d1339e11707b6459152396320acc1b8
2 files changed