* Single owner for the Chrome DevToolsActivePort startup deadline
Cold Chrome startup tolerance was spelled three ways for one wait: the helper
fell back to 15,000 ms, the runtime fixture lifecycle passed a literal 60,000,
and the real-browser verifier kept a local 60,000 constant. A per-caller literal
quietly changes how long a lane tolerates a cold browser before it fails, and
the failure reported only elapsed_ms, so a reader could not see which ceiling
was hit.
Export BROWSER_DEVTOOLS_STARTUP_TIMEOUT_MS as the owner, use it for the helper
fallback and both call sites, and report startup_timeout_ms in
BrowserStartupError. A source guard keeps callers from restating the number.
* Pin the DevToolsActivePort deadline guard to the startup call argument
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Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>
morluto
The one -Niu