InputTracer: Introduce TracedEventArgs to track secure events

Introduce TracedEventArgs to give the tracing backend additional
information about the traced event.

We start by tracking whether an event is secure. An event is marked as
secure if it is targeting at least one secure window.

For now, do not trace secure events in the perfetto backend.

Bug: 210460522
Test: manual with perfetto
Change-Id: I41648d769319e47486556d0a2d6b8f02142048d2