Chrome PFQ builds its own binhost for Chrome. Since Portage refuses to use binary packages from different binhosts depending in build time, all packages directly or indirectly depending on chromeos-base/chromeos-chrome are always built from source.

Affected packages are:
chromeos-base/autotest-all
chromeos-base/autotest-chrome
chromeos-base/autotest-private-all
chromeos-base/autotest-private-tests-authpolicy
chromeos-base/autotest-private-tests-echoprivate
chromeos-base/autotest-private-tests-pagecycler
chromeos-base/autotest-private-tests-quickoffice
chromeos-base/autotest-tests-arc-public
chromeos-base/autotest-tests-cryptohome
chromeos-base/autotest-tests-ownershipapi
chromeos-base/telemetry