Roll src/third_party/dawn 64fcf3909ac9..d4302437c9f1 (1 commits)

https://dawn.googlesource.com/dawn.git/+log/64fcf3909ac9..d4302437c9f1

git log 64fcf3909ac9..d4302437c9f1 --date=short --first-parent --format='%ad %ae %s'
2020-04-22 enga@chromium.org Add depth texture sampling and tests for only depth32float

Created with:
  gclient setdep -r src/third_party/dawn@d4302437c9f1

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dawn-chromium-autoroll
Please CC cwallez@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/+/master/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:dawn-linux-x64-deps-rel;luci.chromium.try:dawn-mac-x64-deps-rel;luci.chromium.try:dawn-win10-x64-deps-rel;luci.chromium.try:dawn-win10-x86-deps-rel
Bug: None
Tbr: cwallez@google.com
Change-Id: I25d195352d9ebaed8aae3f76b3d9483f6b19001c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161745
Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#761636}