Added lazy-in-viewport custom metric (#202)
Added lazy-in-viewport custom metric (#202)

* Added lazy-in-viewport custom metric

* Revert "Added lazy-in-viewport custom metric"

This reverts commit c640b362063229ae604947769408cebb8b8c1c17.

* Updated Images custom metric to include loading and in-viewport properties
HTTPArchive/httparchive,HTTPArchive/httparchive