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Frames which are started prior to first contentful paint will not be added to frame_sorter and as a result would not be reported as part of normalized smoothness metrics.

Bug: 1157479
Change-Id: I665172b297c38ada0e2d468417342e5c2df06374
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584647Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836278}