https://github.com/webmachinelearning/webnn/pull/149 introduces - [`MLContext`](https://webmachinelearning.github.io/webnn/#api-mlcontext) - [`MLGraphBuilder`](https://webmachinelearning.github.io/webnn/#api-mlgraphbuilder) - [`MLGraph`](https://webmachinelearning.github.io/webnn/#api-mlgraph) The corresponding webnn-polyfill issue is https://github.com/webmachinelearning/webnn-polyfill/issues/42