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This CL adds Ozone/Linux CI Test configuration. Initially, it will
run the same gtests as CQ Test configuration to be sure the
config is correct.

Later, when the testers are up and running on CI,
chromium_linux_gtests will be used instead.

R=dpranke
CC=msisov

Bug: 1142753
Change-Id: If1173c93f12774569c257dd8ad04abab2f99a434
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529098
Commit-Queue: Maksim Sisov (GMT+2) <msisov@igalia.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#826188}