This patch adds DawnAdapterPropertiesPowerPreferenceDescriptor for
querying adapter power preference which is useful to distinguish
different logical adapters created on same physical device but with
different power preferences.
Bug: dawn:1516
Test: dawn_unittests
Change-Id: I12ed6e370f8b57c860520154565765f0ee894831
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/102780
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>