Roll src/third_party/dawn 9e64afcb91f7..b6acae6d353d (7 commits)

https://dawn.googlesource.com/dawn.git/+log/9e64afcb91f7..b6acae6d353d

git log 9e64afcb91f7..b6acae6d353d --date=short --no-merges --format='%ad %ae %s'
2019-10-14 cwallez@chromium.org Suppress BufferUploadPerf for setSubData of 16MB on Vulkan
2019-10-11 cwallez@chromium.org Vulkan: Properly handle errors for fences and commands
2019-10-11 cwallez@chromium.org Vulkan: Proper error handling for submission.
2019-10-11 cwallez@chromium.org Vulkan: Handle errors when creating VkRenderPass
2019-10-10 bryan.bernhart@intel.com BufferUploadPerf: Measure various buffer sizes.
2019-10-10 rafael.cintron@microsoft.com Add CommandRecordingContext to D3D12
2019-10-10 cwallez@chromium.org Make the offset of SetIndexBuffer default to 0

Created with:
  gclient setdep -r src/third_party/dawn@b6acae6d353d

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
TBR=cwallez@google.com

Bug: None
Change-Id: I463353be99d696810be76baaa148822fe01f2ca3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859944Reviewed-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@{#705546}

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': '9e64afcb91f74e75a16fa5639d272c5c2a536bc6',
+  'dawn_revision': 'b6acae6d353d3a4b9b9054a72239144ead122f8d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.