Roll src/third_party/dawn 93f88af15b3c..2550e967241f (2 commits)

https://dawn.googlesource.com/dawn.git/+log/93f88af15b3c..2550e967241f

git log 93f88af15b3c..2550e967241f --date=short --first-parent --format='%ad %ae %s'
2020-03-17 enga@chromium.org Fix OpenGL over-eager lazy zero initialization for textures
2020-03-17 enga@chromium.org Fix Vulkan over-eager lazy zero initialization for textures

Created with:
  gclient setdep -r src/third_party/dawn@2550e967241f

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: I998101d7c83a2331c1c5316398b6396aca318021
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106930
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@{#750868}

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': '93f88af15b3cd469bba2a5e0d33a52235beb262a',
+  'dawn_revision': '2550e967241f415eebe5a0a897e21d8e51899c56',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.