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This is a reland of fd8826a6.

Includes a further fix to BackgroundTracingActiveScenario, which was
accidentally setting a default-sized trace buffer for all its sessions
and causing OOMs (crbug.com/997610). Also rebased after non-perfetto
tracing backend was removed recently. Relevant changes in PS 2 -> 5.

> Reland "tracing: Enable startup tracing for spawned child processes"
>
> This is a reland of e40282f6.
>
> Includes a fix to BackgroundTracingActiveScenario, which could end up enabling
> TraceLog without installing the TraceEventDataSource overrides on Android, see
> patch set 1 -> 2. This likely caused the crashes observed in crbug.com/997582.
>
> Original change's description:
> > tracing: Enable startup tracing for spawned child processes
> >
> > Enables startup tracing for child processes spawned by the browser while
> > a tracing session is active.
> >
> > This allows us to collect early trace events in the period of time
> > before the child connects to the tracing service.
> >
> > Bug: 968424
> > Change-Id: I1708cabae77cdd2ab3a33929c28cfab04eb723e3
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1755746
> > Commit-Queue: Eric Seckler <eseckler@chromium.org>
> > Reviewed-by: Avi Drissman <avi@chromium.org>
> > Reviewed-by: ssid <ssid@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#689599}
>
> Bug: 968424
> Change-Id: Id69f0821671caf05238896d4a0e1b581b5d5be44
> TBR: avi@chromium.org
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1782812
> Commit-Queue: Eric Seckler <eseckler@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: ssid <ssid@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#694981}

Bug: 968424, 997610
Change-Id: Idd63d6c69ded2d8ff56641c7a39de57847809cf0
TBR: avi@chromium.org,ssid@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832202Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701213}