Roll src/third_party/dawn 8aa036e9e498..7777078fb902 (2 commits)

https://dawn.googlesource.com/dawn.git/+log/8aa036e9e498..7777078fb902


git log 8aa036e9e498..7777078fb902 --date=short --no-merges --format='%ad %ae %s'
2019-05-24 kainino@chromium.org Null backend: disallow more than 256M of Buffer allocations
2019-05-24 natlee@microsoft.com Add nonzero_clear_resources_on_creation_for_testing toggle for d3d12


Created with:
  gclient setdep -r src/third_party/dawn@7777078fb902

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

Change-Id: I344a63a80b7ab236e15287b89f4fda3a471d4346
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1630170
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@{#663401}
diff --git a/DEPS b/DEPS
index afea8d7..1cb3e1b 100644
--- a/DEPS
+++ b/DEPS
@@ -273,7 +273,7 @@
   # 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': '8aa036e9e498fb99756d507fc7a6b6f7ebce6767',
+  'dawn_revision': '7777078fb902ac6cf811847286c788f44795dce6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.