Implement a site engagement score based on time-on-site.
Time spent on site is an important indicator of how important an origin
is to a user. This CL detects time on site by registering callbacks to
handle user input, using any mouse or keypress events as a proxy for
a user spending time on the site. Input events are checked for at
regular intervals, with site engagement updated if input has been
present in each interval.
Review URL: https://codereview.chromium.org/1338603002
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