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Add GPUMapMode/GPUMapModeFlags definitions, in prep for implementing the
new WebGPU buffer mapping primitives.

GPUDevice.lost is exposed on workers; it was just a small mistake that
GPUDeviceLostInfo wasn't as well.

Bug: 1069302
Change-Id: Icc54e28d1b65b05a8d189dda9ce4dad1e0ec29d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2305022Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789816}