Returns the requestDevice descriptor to pass to adapter.requestDevice().
Includes requiredFeatures: ["timestamp-query"] when benchmark is enabled and supported;
returns an empty descriptor otherwise so the device is still created without benchmark support.
Returns the
requestDevicedescriptor to pass toadapter.requestDevice(). IncludesrequiredFeatures: ["timestamp-query"]when benchmark is enabled and supported; returns an empty descriptor otherwise so the device is still created without benchmark support.