As we add traces tests, some were recorded expecting depth as an
attachment to framebuffer 0. This causes errors when they
unconditionally query info about depth attachments. Since perf tests
have never requested a config before (they are all DONT_CARE for each
componenent), go ahead and set one shared by all.

Test: angle_perftests
Bug: b/157158456
Change-Id: I83ef1a58f246bfbc98c3bc7e024aca01560107f7
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2210966
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>