Increase ThreadTest tolerance

Aims to fix flaky test.
Decreased minimum from 90% to 80%.
Increased maximum from 110% to 120%.
Increased maximum waitMillis from 10ms to 30ms.

Bug: 18788389

(cherry picked from commit 0311cd2be856e4c5872ebbe5ac7e12eac334ad73)

Change-Id: Ie3d84cf71769208e851b9fa7587c62858efdf4dd
1 file changed