Roll src/third_party/dawn 74e4834d3d25..9b45b5aafa37 (1 commits)

https://dawn.googlesource.com/dawn.git/+log/74e4834d3d25..9b45b5aafa37

git log 74e4834d3d25..9b45b5aafa37 --date=short --no-merges --format='%ad %ae %s'
2019-08-12 bryan.bernhart@intel.com Handle staging buffer map failure on Metal.

Created with:
  gclient setdep -r src/third_party/dawn@9b45b5aafa37

The AutoRoll server is located here: https://autoroll.skia.org/r/dawn-chromium-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


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: Ia91a71b928104ac43f663a35ffda5e10dfaae009
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1749655Reviewed-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@{#686265}

DEPS

@@ -295,7 +295,7 @@ 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': '74e4834d3d2583abf5c24e7de83980e536809718',
+  'dawn_revision': '9b45b5aafa377817ea1af1aadccfe44598d8ec68',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.