Base: Adjust time tolerance in ProcessTest.CreationTimeOtherProcess.

This test failed on bot Linux CFI with:

[ RUN      ] ProcessTest.CreationTimeOtherProcess
../../base/process/process_unittest.cc:159: Failure
Expected: (before_creation - kTolerance) <= (creation), actual: 2019-01-08 12:59:12.953 UTC vs 2019-01-08 12:59:12.950 UTC

The failure is due to clock imprecision, so it makes sense to
increase the tolerance.

On non-Linux platform, it makes sense to reduce the time tolerance.

Change-Id: I0e37c84064f5af3067c503f788d8376f7d2a7e51
Reviewed-on: https://chromium-review.googlesource.com/c/1401230
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622851}
1 file changed