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This is a reland of 480f5952

Original change's description:
> GPUQueue.writeBuffer takes offset/size in elements with TypedArrays
>
> Previously dataOffset and size were always in bytes, which isn't
> consistent with the WebGPU spec.
>
> Corresponding CTS test here: https://github.com/gpuweb/cts/pull/431
>
> Bug: 1163667
> Change-Id: I5360cfbd66542c044dcf909b8673d3ed3f5e6724
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615520
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Commit-Queue: Brandon Jones <bajones@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#841617}

Bug: 1163667
Change-Id: Ie6dd20221445d93124946b3839c75149bd791292
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617864Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841776}