Brandon Jones 29716a2fb5 Change Copy Validation To Allow Depth = 0 Copies
Existing validation requiring copy depth = 1 is not accurate. Copies
with a depth of 0 should be allowed.

Bug: dawn:18
Change-Id: Ib7607ee0965935127b3a8b66bc49b38ddcc56953
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/5940
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Brandon Jones <brandon1.jones@intel.com>
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