Do not se Tolerance if ComputeTolerance is set
Otherwise, you the following could happen:
SetComputeTolerance(false)
SetTolerance(value)

GetTolerance() will return value.

SetComputeTolerance(true)

GetTolerance() will return something != value.

Change-Id: I0b44214827aa22d5e2cd29d2b6848364f0fd257c