Add use-counter and WebDX feature mapping for spelling-grammar-error.
Change-Id: I28819ef9020fba438681e4e6154e71c33b4e7a68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5998680
Reviewed-by: Noam Rosenthal nrosenthal@chromium.org
Reviewed-by: Shunya Shishido sisidovski@chromium.org
Commit-Queue: Steinar H Gunderson sesse@chromium.org
Cr-Commit-Position: refs/heads/main@{#1380340}