Add PerformanceElementTiming API (#7436)
Add PerformanceElementTiming API (#7436)

Co-authored-by: Joseph Medley <e5f32d9ca37888f2e401c8370536acae62d3b209@google.com>
Co-authored-by: Philip Jägenstedt <3ba3974e96044dcde818e6310ed799abe10671d4@foolip.org>
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data