Roll Dawn from e370ec6de4fa to 6a029fc9d84e (4 revisions)

https://dawn.googlesource.com/dawn.git/+log/e370ec6de4fa..6a029fc9d84e

2020-05-27 jiajie.hu@intel.com Only download binutils in standalone build
2020-05-27 yunchao.he@intel.com Implement texture subresource on Vulkan
2020-05-26 natlee@microsoft.com Fire map callback if map async operation fails
2020-05-26 rharrison@chromium.org Rolling 9 dependencies

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/+doc/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: I9029990bc62a7210832b08bcbf4af4f11e3febc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2217074Reviewed-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@{#772085}

DEPS

@@ -301,7 +301,7 @@ 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': 'e370ec6de4fae8270cd68c00b818d9b44c67667b',
+  'dawn_revision': '6a029fc9d84edb5ddfb88c6be6c02c5dbc1ccd63',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.