[Mobile Vitals] Time-to-initial-display & initial concept for time-to-full-display#4088

Draft

aritchie wants to merge 12 commits intomainfrom

mobile_vitals_ttid_ttfd

Commits on Feb 25, 2025

Initial
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WIP
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Commits on Mar 6, 2025

Merge branch 'main' into mobile_vitals_ttid_ttfd
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Commits on Mar 13, 2025

WIP
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Commits on Mar 31, 2025

Commits on Apr 5, 2025

Commits on Apr 7, 2025