make ttl test size medium, as it can very rarely timeout otherwise see b/162779014 (#5909)
make ttl test size medium, as it can very rarely timeout otherwise see b/162779014 (#5909)


PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs