Roll src/third_party/dawn 2de34c1791f3..e3f3e9a80d5f (6 commits)

https://dawn.googlesource.com/dawn.git/+log/2de34c1791f3..e3f3e9a80d5f

git log 2de34c1791f3..e3f3e9a80d5f --date=short --first-parent --format='%ad %ae %s'
2020-03-06 cwallez@chromium.org Revert "Vulkan: Report and enable subgroup size control device extension."
2020-03-06 cwallez@chromium.org Revert "Vulkan: Enforce fixed subgroup size for compute shaders."
2020-03-06 cwallez@chromium.org GN: Use the hermetic XCode if available.
2020-03-05 natlee@microsoft.com Query if Texture subresource has been initialized
2020-03-05 david.turner.dev@gmail.com Vulkan: Enforce fixed subgroup size for compute shaders.
2020-03-05 david.turner.dev@gmail.com Vulkan: Report and enable subgroup size control device extension.

Created with:
  gclient setdep -r src/third_party/dawn@e3f3e9a80d5f

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: chromium:1036080,chromium:1059205
Tbr: cwallez@google.com
Change-Id: I3b42808fc1c72dd2c0812e1f09cf32906edbdade
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2091413Reviewed-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@{#747700}

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': '2de34c1791f301f8ec647afd9011dd3afd502465',
+  'dawn_revision': 'e3f3e9a80d5f937470aacda7b810a88fc85e8b19',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.