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This CL adds new metrics to record the timing on requestAnimationFrame
three times after the page is restored from BFcache. These values can be
good approximation for the first paint after BFcache restores, and we
want to confirm this.

BUG: 1133333
BUG: 1152688
Change-Id: Ib7fe363bf6ac20f07308bd90eb940530fcd49df1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523133
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830919}