Respond to 2278541.

src/Entity/Page.php

src/Entity/PageAccess.php

src/PageInterface.php

src/Plugin/ConditionAccessResolverTrait.php

src/Plugin/ConditionPluginBag.php

src/Plugin/PageVariant/BlockPageVariant.php

src/Plugin/PageVariantBase.php

src/Plugin/PageVariantInterface.php

tests/src/ConditionAccessResolverTraitTest.php

tests/src/PageVariantTest.php