Roll src/third_party/dawn 402fbcca936b..20b416235aa6 (1 commits)

https://dawn.googlesource.com/dawn.git/+log/402fbcca936b..20b416235aa6

git log 402fbcca936b..20b416235aa6 --date=short --no-merges --format='%ad %ae %s'
2019-10-24 ppluciennik@opera.com Move ldflags (Metal dependency) to libdawn_native.

Created with:
  gclient setdep -r src/third_party/dawn@20b416235aa6

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: chromium:1003381
Change-Id: I306a0a9c77c4c84f2d94344b4bae54284f51391e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877622Reviewed-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@{#708981}

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': '402fbcca936b3ecc8ede079f5cb1f87c818811b4',
+  'dawn_revision': '20b416235aa6ec0adc850469c00a4fbe8aee0e0b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.