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charliea authored
In a follow-up CL, the return value of this method will be written into traces recorded by Chrome so that, when syncing Chrome traces with external traces, we have more information to determine whether the two traces use timestamps from the same underlying clock and can therefore be combined. BUG=597350 Review URL: https://codereview.chromium.org/1824673002 Cr-Commit-Position: refs/heads/master@{#384352}
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