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This CL had to be reverted because GPU bots were failing because the
results_merger.py script could not handle the test_name_prefix field
that was still getting populated in the JSON results. This CL will
add the metadata field along side the test_name_prefix field in the
Optional fields list in the results_merger.py script. It also removes
the checking of test_name_prefix in the gpu unit tests because the
test_name_prefix field will be removed from the top level of the
results in a future CL.

Bug: chromium:698902
Change-Id: I4867e60ca5a97d426d5fd1a4de08e26c14d326ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559492
Commit-Queue: Rakib Hasan <rmhasan@google.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649665}