Add functions for measuring first draw

Extends startup functionality to be able to pull first frame time which
is Android's metric instead of Chrome's notion of first draw.

Bug: b:448444575
Change-Id: Iba3b6f070d03296376ef8fbee6a2f8d7a1eed864
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7069968
Reviewed-by: Anand Ravi <[email protected]>
Commit-Queue: Yaron Friedman <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1534307}
NOKEYCHECK=True
GitOrigin-RevId: 1cbc895aaf9d977ea81be82559c9982253cd4e36
2 files changed