GitLab

- As for input.valueAsDate, add separated counters for the getter and
  the setter.
- file.lastModifiedDate already has a counter.

Bug: 988353
Change-Id: Ia5fa197705698c0e3465c079b77f8d8d426c6cdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943068Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720110}