Roll src/third_party/dawn f15fc26d5bf5..d1db0e94b0df (2 commits)

https://dawn.googlesource.com/dawn.git/+log/f15fc26d5bf5..d1db0e94b0df

git log f15fc26d5bf5..d1db0e94b0df --date=short --first-parent --format='%ad %ae %s'
2019-12-10 enga@chromium.org docs: Add section about dawn_perf_tests
2019-12-10 rharrison@chromium.org Use correct Initialize call to spvc for Metal backend

Created with:
  gclient setdep -r src/third_party/dawn@d1db0e94b0df

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: Ic2149df74ca3b8dbe5738fcae8d28a02d8c640f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1960999Reviewed-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@{#723643}

DEPS

@@ -303,7 +303,7 @@ 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': 'f15fc26d5bf5d71f342eb44109a201aa59ad1e8c',
+  'dawn_revision': 'd1db0e94b0df26a300998a1b4d9560efe9ed3abf',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.