Roll src/third_party/dawn 6574f92747a2..ab2c84ffd2a4 (3 commits)

https://dawn.googlesource.com/dawn.git/+log/6574f92747a2..ab2c84ffd2a4

git log 6574f92747a2..ab2c84ffd2a4 --date=short --first-parent --format='%ad %ae %s'
2020-04-09 brandon1.jones@intel.com Residency 6: Enable D3D12 Residency and Add Tests
2020-04-09 brandon1.jones@intel.com Residency Bug: Make Setting Heap's Last Submission Serial Optional
2020-04-09 enga@chromium.org Fix use-after-free if BindGroup is the last owner of its BindGroupLayout

Created with:
  gclient setdep -r src/third_party/dawn@ab2c84ffd2a4

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
Bug: None
Tbr: cwallez@google.com
Change-Id: Ib548fabc724d328e6e38160336d7356635cb3b6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145176Reviewed-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@{#758111}

DEPS

@@ -302,7 +302,7 @@ 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': '6574f92747a23fd7ae2a69ebaf11aade122b20b4',
+  'dawn_revision': 'ab2c84ffd2a49a97abf4c22b1e88e42f8d02c1ff',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.