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Adds a new resultdb_bigquery_export entry to the GPU team's CI builders,
exporting to luci-resultdb.chromium.gpu_ci_test_results. This is so that
we can query the GPU test results more efficiently for an upcoming
script.

Bug: 1134751
Change-Id: Id4df6f97b920d4d91b2fd7e0e08dd196a3d469f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446893
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814017}