Roll src/third_party/dawn 20b416235aa6..6da1770507ec (1 commits)

https://dawn.googlesource.com/dawn.git/+log/20b416235aa6..6da1770507ec

git log 20b416235aa6..6da1770507ec --date=short --no-merges --format='%ad %ae %s'
2019-10-24 yunchao.he@intel.com Fix ambiguous errors for bind group

Created with:
  gclient setdep -r src/third_party/dawn@6da1770507ec

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
TBR=cwallez@google.com

Bug: None
Change-Id: Ic6f0427ccf4819a962510581ee81ff8acd63a99a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879512Reviewed-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@{#709171}

DEPS

@@ -310,7 +310,7 @@ 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': '20b416235aa6ec0adc850469c00a4fbe8aee0e0b',
+  'dawn_revision': '6da1770507ec5695b2c3383ab7a8d7ac4b7d9a3c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.