InputTracer: Add custom key and motion event types for tracing

Introduce the tracing backend's equivalent of KeyEntry and MotionEntry
so that we don't have to reuse the Dispatcher's EventEntry types inside
the tracing implementation.

Bug: 210460522
Test: atest inputflinger_tests
Change-Id: I7f0c1d79bb8ee345ae9968d2ff5006a7cd9b2cb3
1 file changed