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DevTools performance metrics now allows collection and reporting of
duration related metrics using monotonically increasing abstract time
and thread running time.

Change-Id: Ica54cc291ba456c8dcc6a47a962e99a87cb8a475
Reviewed-on: https://chromium-review.googlesource.com/1247528Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Peter Kvitek <kvitekp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595262}