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- Split "realtime" into the two different concepts we've been conflating.
  "Immediate" means we know immediately when the metric occurred.
  "Performant to compute" means we can compute it in a RUM context.

- Fill in/update the TTI example.

Change-Id: I5bf1ea0357eb4b7c3f81b3a0e4112d48ec3f2296
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230930
Commit-Queue: Annie Sullivan <sullivan@chromium.org>
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775301}