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Reland with the fixes on the missing check in the test bodies so that they can early
return when the platform does not support WebGPU.

Original change's description:
WebGPU: Add early-returns in the request of adapter and device when context is lost

This patch adds early-returns in the request of GPUAdapter and GPUDevice
when the WebGPU context is lost.

In the following patches we will implement more clean-ups when the
WebGPU context is lost.

TBR=kbr@chromium.org

Change-Id: I64f6b4c88d868f0e83c131875bfacd465279948a
Bug: chromium:996713
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2119350
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753173}