[Clank Startup Metrics] Reworking Clank Cold Start Guardrail Metric Implementing TimeToFirstVisibleContent3 and enabling the removal of code for the v2 metric. The new metric is calculated as follows: TimeToFirstVisibleContent3 = min(Startup.Android.Cold.TimeToFirstNavigationCommit3.Tabbed, Browser.PaintPreview.TabbedPlayer.TimeToFirstBitmap). Renamed Startup.Android.Experimental.FirstContentfulPaint.Tabbed.ColdStartTracker to Startup.Android.Cold.TimeToFirstContentfulPaint3.Tabbed. There is no v2 for it, but there's no need for the names to overlap in stable. Bug: 40926074 Change-Id: I413da1d0d1434f5544e5486313f307ffabb0abbe Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5736769 Reviewed-by: Egor Pasko <pasko@chromium.org> Reviewed-by: Sean Maher <spvw@chromium.org> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com> Commit-Queue: Nafis Abedin <nafisabedin@google.com> Reviewed-by: Michael Thiessen <mthiesse@chromium.org> Cr-Commit-Position: refs/heads/main@{#1336004}
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