Roll Dawn from 145f115c5496 to 306fc502cf96 (2 revisions)

https://dawn.googlesource.com/dawn.git/+log/145f115c5496..306fc502cf96

2020-09-28 cwallez@chromium.org Use typed integers for the Fence FenceAPISerial
2020-09-28 cwallez@chromium.org Use typed integers for the Buffer MapRequestID

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/+doc/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: I4e8238f44655cbed855d15e6be8ae8bb3ebd7b21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435488Reviewed-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@{#811270}

DEPS

@@ -318,7 +318,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'dawn_revision': '145f115c5496a0c4ab17d13a20410143b0ce03d4',
+  'dawn_revision': '306fc502cf96ea95e306d0949108cfa3f838d5e8',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.