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Add back screenshot extension that was temporarily disabled. (#21828)

Add back screenshot extension that was temporarily disabled.

Add matchesReferenceImage matcher to test that the screenshot extension
generates equivalent images to InspectorService.instance.screenshot.
J
Jacob Richman committed
ccd070a5b42d18d1b8dfce4e8b59417373122dc2
Parent: b01d3a2
Committed by GitHub <noreply@github.com> on 9/18/2018, 1:32:39 PM