Add trace event arg to tell if event came from System

We see that some of the MotionEvents have their down time later than the
event time i.e. MotionEvent.GetDownTime() > MotionEvent.GetEventTime().
To confirm if the timestamps are coming faulty from the system or are
being synthesized wrongly on app/client side frame work code, we are
adding the arg to tell if the event came from system or not. The arg is
not always set to avoid having to make binder
call(InputManager.verifyInputEvent).

Bug: 406485568, b/410789413
Change-Id: I4722711ec54d8d509be2fa9ef6358b1fbd9e6dd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6491373
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Mikhail Khokhlov <khokhlov@google.com>
Commit-Queue: Kartar Singh <kartarsingh@google.com>
Cr-Commit-Position: refs/heads/main@{#1453460}