Roll src/third_party/dawn 7982cc052763..3da19b843ffd (2 commits)

https://dawn.googlesource.com/dawn.git/+log/7982cc052763..3da19b843ffd

git log 7982cc052763..3da19b843ffd --date=short --first-parent --format='%ad %ae %s'
2020-03-31 cwallez@chromium.org Use the default values for Dispatch in examples and tests
2020-03-31 cwallez@chromium.org Add the defaults for Draw and DrawIndexed

Created with:
  gclient setdep -r src/third_party/dawn@3da19b843ffd

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: Ia299e1a151a2b992dfbd66747669f457ec35974c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130844Reviewed-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@{#755167}

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': '7982cc0527630f123bd844cf5bb97ad0c3e0041c',
+  'dawn_revision': '3da19b843ffd63d884f3a67f2da3eea20818499a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.