Set high usage delta to 1 to avoid constant V8 GC.

This value will be passed to native webkit to V8.

3 consecutive dromaeo DOM core are run, there's no crash.
Because of assets change, Passion browser can't be run; this will
need to be checked in I release, I think

issue: 3317722
Change-Id: Ifa6e4116f76f395d98db9f8336f91dc9de6bf125