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This runs a given gtest binary 2 tests at a time (with
--gtest_shuffle and --gtest_repeat to try to encourage both
orderings of the test), and reports on any pairs that fail.

Change-Id: I9f4f8698aa97988a18290a4a5e5561975aac9aad
Reviewed-on: https://chromium-review.googlesource.com/646851Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517141}