GitLab

Fix a number of minor style deviations in the touch filtering code:

- Add blank lines where they are typically expected
- Avoid some potential namespace conflicts by using less generic names
- Un-abbreviate some local variable names
- Make structs less interesting by pulling member functions out
- Replace TimeTicks::UnixEpoch() with TimeTicks() as we don't care about dates
- s/const static/static const/
- Exports come before any other qualifiers.
- Opportunistically constify a few members
- Define assignment operators when there are copy/move constructors.
- Class data members must be either private or const.
- Only one declaration per statement.

Change-Id: I35570a98a82d8a60c04c1b956e278f40e1b694b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839435Reviewed-by: Rob Schonberger <robsc@chromium.org>
Commit-Queue: Rob Schonberger <robsc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708917}