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The Viz work on Mac has stabilized. The flakes we see in tests on our FYI bots
are general flakes. The original GL and Surface Invariants errors that prevented
us from running on the waterfall have all been fixed.

This adds the Viz testing group to the list of mac tests.

TEST=viz_browser_tests, viz_content_browsertests, viz_content_unittests

Bug: 850137
Change-Id: Ieef76cd4457bd967909cb56622fbfd243cbc38ae
Reviewed-on: https://chromium-review.googlesource.com/1095687Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567685}