The trace viewer interprets the slice as a non-terminating
time interval which is quite opposit to what trace records indicate
(i.e., almostly immediately terminating time interval).
As observed in the issue #24663 this can result in quite misleading
visualization of the trace.

Work around the trace viewer's issue by setting a small value
(0.0001usec) as the duration if the time interval is not positive.

Change-Id: I1c2aac135c194d0717f5c01a98ca60ffb14ef45c
Reviewed-on: https://go-review.googlesource.com/104716Reviewed-by: Heschi Kreinick <heschi@google.com>