Roll src/third_party/swiftshader 6652f0b64287..a68a80a4dbf9 (1 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/6652f0b64287..a68a80a4dbf9

git log 6652f0b64287..a68a80a4dbf9 --date=short --no-merges --format='%ad %ae %s'
2019-10-17 sugoi@google.com Vulkan header update

Created with:
  gclient setdep -r src/third_party/swiftshader@a68a80a4dbf9

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-chromium-autoroll
Please CC swiftshader-team+autoroll@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:android_optional_gpu_tests_rel;luci.chromium.try:linux_chromium_msan_rel_ng;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
TBR=swiftshader-team+autoroll@google.com

Bug: chromium:b/139800520
Change-Id: I5074253515186d087f8e97d983206823019c040a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866075Reviewed-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@{#707014}

DEPS

@@ -183,7 +183,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.
-  'swiftshader_revision': '6652f0b6428777b5a4a3d191cc30d8b31366b999',
+  'swiftshader_revision': 'a68a80a4dbf9dc7fab42a2734c854a41d23136cc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.