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This change adds use counters for counting V8 function calls in detached
windows. They aren't emitted the usual way, because the use counter
infrastructure doesn't work on detached windows. Instead they're plumbed
through instance counters to be emitted via UKM.

Bug: 1018156
Change-Id: I2c85604c9a96b9aec50896a74c089cf5eacfa61d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1925839
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Primiano Tucci <primiano@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721875}