[LoAF] Add id to AnimationFrame trace events.

Example traces:
Recorded in DevTools: https://trace.cafe/t/odPynq2G6M
Recorded in Perfetto: https://ui.perfetto.dev/#!/?s=63ca539f35e0e943a691c3908449f00b5c09e0063be87c5e318a44806261421f

The trace JSON does not include ids in TRACE_EVENT_END/'e' events,
whether or not I add the code to the macro. Since it does nothing, I
did not include this code in the macro.

Change-Id: Id0d25cddda41ae96f06692b511da92876688ac96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5572472


Reviewed-by: Michal Mocny <mmocny@chromium.org>
Commit-Queue: Annie Sullivan <sullivan@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313600}