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The underlying Swarming hardware's been upgraded. Try running tests on
the newer configuration, which also includes Mesa 19.0.2.

Also change the short name on the waterfall to "exp" from "rel".

Bug: 927465, 950552, 966500
Change-Id: I2b13595615f2919379f4a49ac1f928646e493d65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1666530
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Auto-Submit: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671520}