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In non-single-process tests, there's a good chance that two unit tests
running in the same process need to set different client names.
Currently whichever comes second cannot set the client name correctly.

However, there is no ideal way to test both processes. Resetting the
client names in the test doesn't work because the histogram has static
client name which invalidates the name resetting. To fix, it requires
confusing work-around in the code therefore we prefer to test only one
process after all the logic is almost identical.

Bug: 749366
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Iebd312e1138292754f4aa2aa1875b13365e5602f
Reviewed-on: https://chromium-review.googlesource.com/590172Reviewed-by: Vladimir Levin <vmpstr@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490778}