Add use-counter and WebDX feature mapping for calc-constants.
There are no clear WPT tests for e/pi (e.g. pi is only used inside
the sin-cos-tan tests), so we don't add a WPT mapping for them.
Change-Id: I36fe37239bcb5c1b28c9835a2c5c3c2cd08cbcfb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6000633
Reviewed-by: Shunya Shishido sisidovski@chromium.org
Commit-Queue: Steinar H Gunderson sesse@chromium.org
Reviewed-by: Daniil Sakhapov sakhapov@chromium.org
Cr-Commit-Position: refs/heads/main@{#1379608}