[UKM] Record FCP information in Blink.UpdateTime
Add a boolean metric to Blink.UpdateTime to record whether the event was before or after FCP (First Contentful Paint). Also re-organise the way we report FCP to LocalFrameView for the purposes of the new metric and triggering commits. The latter reduces code in PaintTiming. Bug: 1001199 Change-Id: Ibc18faae13ece92e1270c72548585e1f3c4dcc2e Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864366Reviewed-by:Robert Kaplow <rkaplow@chromium.org> Reviewed-by:
vmpstr <vmpstr@chromium.org> Commit-Queue: Stephen Chenney <schenney@chromium.org> Cr-Commit-Position: refs/heads/master@{#710029}
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