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This ensures that the memory and clang tot bots run the same tests as the
main waterfall bots.

Everything running on the main waterfall must be tested with clang/tot too
to make sure compiler updates don't break anything. This change makes it
impossible for things to get out of sync (on linux).

No behavior change, the chromium_linux_gtests and chromium_linux_clang_gtests
were identical already.

Also rename chromium_linux_clang_and_gl_gtests to chromium_linux_and_gl_gtests
and add a comment for it.

Bug: 843511
Change-Id: Idf95d837cdae5247d2011c85f2c19961d29bd195
Reviewed-on: https://chromium-review.googlesource.com/1093062Reviewed-by: Hans Wennborg <hans@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565666}