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The ARM DTK does not specify a PCI device ID for the GPU. Do not fail
in this configuration. There are other places, GPUTestConfig::IsValid,
for instance, where we explicit allow a zero device ID.

Of note is that zero device IDs are allowed only when there is a
single GPU. ANGLE's current enumeration code will only enumerate
non-PCI devices once no PCI devices are found, so this is will
continue to work for the moment.

Bug: 1110421, 1121663, 1121672
Change-Id: I7cba1c4d074c291663913b970db3e4085afa0adc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387308Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803553}