Roll Dawn from 793a07e36636 to d1bca09f4ab3 (6 revisions)

https://dawn.googlesource.com/dawn.git/+log/793a07e36636..d1bca09f4ab3

2020-10-12 kainino@chromium.org Change rowsPerImage units from texels to blocks
2020-10-12 natlee@microsoft.com Have Queue timeline tasks resolve in order
2020-10-12 cwallez@chromium.org Make SetScissorRect match upstream WebGPU specification.
2020-10-12 hao.x.li@intel.com Query API: Timestamp Query on Metal
2020-10-11 cwallez@chromium.org Make SetViewport validation match upstream WebGPU.
2020-10-10 enrico.galli@intel.com Adding multiple of 4 validation on indirect draws and dispatches

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dawn-skia-autoroll
Please CC enga@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: skia/skia.primary:Build-Debian10-Clang-x86_64-Debug-Dawn
Bug: None
Tbr: enga@google.com
Change-Id: I08faef78225c5c07f375df51ec602072c65c10a1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/325894
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>