Roll src/third_party/dawn 4da46462d786..276b0652658d (4 commits)

https://dawn.googlesource.com/dawn.git/+log/4da46462d786..276b0652658d

git log 4da46462d786..276b0652658d --date=short --first-parent --format='%ad %ae %s'
2020-03-30 yunchao.he@intel.com Add validation tests for resource usage tracking - 4
2020-03-30 cwallez@chromium.org Fix compilation on iOS where setDisplaySyncEnabled isn't available.
2020-03-30 bungeman@chromium.org Add std:: to nullptr_t
2020-03-30 rafael.cintron@microsoft.com Call ID3D12SharingContract::Present on WebGPU swap buffer destroy

Created with:
  gclient setdep -r src/third_party/dawn@276b0652658d

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: I4356776b53fbc158b0c1579977c0eee36503b617
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129177Reviewed-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@{#754796}

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': '4da46462d786fe132d459395c8944aed49b0bcca',
+  'dawn_revision': '276b0652658d1bb1037191fe63930b7cf32aeedc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.