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This test suite seems to be randomly flaky. The retry mechanism
should let the tests pass even if they have up to 2 failures. Even
though they should be 99% deflaked with one retry, give them two
attempts to be 100% sure of not getting a flaky failure. De-flakying
is more important than any other concern.

Also leaves the 'linux_args' setting in the new test spec in case
we end up using it on Linux as well.

Bug: angleproject:5273
Change-Id: Id3deb84b1c5533f37f3b55b9d9659ddc66358544
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517042Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823646}