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The "os" tag is needed to trigger the following condition:
https://codesearch.chromium.org/chromium/build/scripts/slave/recipe_modules/chromium_tests/steps.py?rcl=7d066dd6eac24ac19a1fb1c4f1bc7dd432d433c0&l=1339

That will correctly add the device type to all trigger steps in recipes.
(Purely a QoL change.)

Change-Id: I38d318a0d3814426e5ac8e1e16fd38955e0186fc
Reviewed-on: https://chromium-review.googlesource.com/1086290
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565127}