base1: Use relative time for a metrics channel
base1: Use relative time for a metrics channel

This gives us more useful results when the clock of the metrics source
is wrong, by defining all times to be "browser local".  On the other
hand, latency might now skew the picture.

Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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