beginComputePass method
Opens a compute pass; label names it to a debugger and to
onGpuTimings.
Implementation
@override
ComputeEncoder beginComputePass({String? label}) {
final encoder = inner.beginComputePass(label: label);
final pass = _nextPass++;
events.add(TraceBeginComputePass(pass, label));
return _RecordingComputeEncoder(this, pass, encoder);
}