Brandon Jones b6f4d53126 Only Increment Serials When Necessary On D3D12
Only increments last submitted and last completed serials from the D3D12
backend when commands were submitted to the GPU.

Bug: dawn:119
Change-Id: I01748b7f4ac90443adac4cdef29016184f992e9c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/32162
Commit-Queue: Brandon Jones <brandon1.jones@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
2020-11-13 02:11:12 +00:00
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