GitLab

Adds BrokerProcess:BrokerType to BrokerProcess. It currently only
includes SIGNAL_BASED, but will be used to add USER_NOTIF

Also adds ForkSignalBasedBroker() in BrokerProcess, in order to factor
out the signal mechanism-specific code from BrokerProcess::Init().
Includes some other minor (but related) refactors.

Bug: 1117351
Change-Id: Idadeaafb4ef7bb0f952fd0d901cbfb91d59b3486
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2407059
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809493}