Roll src/third_party/dawn ebcf0d31c012..293ea7746d7f (3 commits)

https://dawn.googlesource.com/dawn.git/+log/ebcf0d31c012..293ea7746d7f


git log ebcf0d31c012..293ea7746d7f --date=short --no-merges --format='%ad %ae %s'
2019-06-26 cwallez@chromium.org Make RenderPipeline::ValidateCompatibleWith produce an error message
2019-06-26 cwallez@chromium.org Add support to NaN in Float32ToFloat16
2019-06-26 cwallez@chromium.org dawn_json_generator: Assert that enum values are unique.


Created with:
  gclient setdep -r src/third_party/dawn@293ea7746d7f

The AutoRoll server is located here: https://autoroll.skia.org/r/dawn-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

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
TBR=cwallez@google.com

Change-Id: I4e6dccff0f2c6de5bf57fa18d87c28af5dcb2a82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1679719Reviewed-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@{#672779}

DEPS

@@ -277,7 +277,7 @@ 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': 'ebcf0d31c012ef603503aa9e5a7a6c600c26feda',
+  'dawn_revision': '293ea7746d7f5bbb8eade19100df0269003dc79c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.