webgpu: fix: conditionally call deprecated GPUAdapter.requestAdapterInfo

[mattvr]

Context

GPUAdapter.requestAdapterInfo is deprecated and non-standard.

It's in use by tfjs-backend-webgpu, but the result is optional, and only used for a single optimization. Yet if called in an environment which doesn't support it, it will throw.

By checking the feature's available before calling it, this unbreaks Deno runtime support for tfjs-backend-webgpu, which doesn't support this feature and throws.

Testing/Verification

yarn test and yarn lint succeed. Verified basic example now works in Deno.

import * as tf from "@tensorflow/tfjs-core";
import "@tensorflow/tfjs-backend-webgpu";

await tf.ready();
tf.randomGamma([2, 2], 1).print();

Related

denoland/deno#22029

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[petamoriken]

Suggested change

	'requestAdapterInfo' in adapter
	? await adapter.requestAdapterInfo()
	: undefined;
	'info' in adapter
	? adapter.info
	: await adapter.requestAdapterInfo();