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Fetch missing Navigation Timing metrics and mwLoadEnd.

Authored by Peter.

Description

Fetch missing Navigation Timing metrics and mwLoadEnd.

Added support for fetching unloadEvent*, redirect*,
domainLookup*, domLoading and domContentLoadedEvent* from
the Navigation Timing API. Also send mediaWikiLoadEventStart
and end as relative to navigation start. Set user timing
for mediaWikiLoadEventEnd.

Bug: T109756
Change-Id: I1aaa31f87e31ec46990fe7420bc664b51927237e