Roll src/third_party/swiftshader ff772a7bcc98..ceb6258ae101 (1 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/ff772a7bcc98..ceb6258ae101

git log ff772a7bcc98..ceb6258ae101 --date=short --first-parent --format='%ad %ae %s'
2020-04-21 amaiorano@google.com CMake: fix astc code not being enabled correctly

Created with:
  gclient setdep -r src/third_party/swiftshader@ceb6258ae101

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;luci.chromium.try:linux-swangle-try-x64;luci.chromium.try:win-swangle-try-x86
Bug: None
Tbr: swiftshader-team+autoroll@google.com
Change-Id: Ib6d74cde9f454a21c14fb7e02c7ba3f1c7196edb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159278Reviewed-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@{#761128}

DEPS

@@ -191,7 +191,7 @@ 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': 'ff772a7bcc9872e034210ad226ea9f94556a3dc8',
+  'swiftshader_revision': 'ceb6258ae1016ebaffb7036561e0cba14c8cc2a7',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.