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Right now in InputRouterImpl::OnTouchEventAck, we append a "T" to the
debug string in TouchActionFilter when the touch event is a touch
sequence start and that the input event ack state is NO_CONSUMER_EXISTS.

This CL make changes to append the input event ack state to the debug
string. The reason is that all the current crashes seems to be the case
that is not acked from the main thread, but we do not know the ack state
yet.

Bug: 851644
Change-Id: Ia57de7aa2c63e104008893dc8809a5eac679460d
Reviewed-on: https://chromium-review.googlesource.com/1219781
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590415}