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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/+/2615520Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841617}