Add a means to consume user activation #1691
Description
Problem: A lot of APIs rely on "transient activation" to work, and there are special failure cases that need to be checked by "consuming the user activation" at particular moments in time. To get around this right now, WPT (for instance) is using hacks trying to requestFullscreen() and then cancelling the request (which is not standardized to actually consume the user activation, making the situation worse).
It would be great if Web Driver provided a means to artificially "consume user activation", thus invalidating the transient activation.
Related discussion:
web-platform-tests/wpt#36481