Roll src/third_party/swiftshader 605f863173b6..a9da772f0587 (2 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/605f863173b6..a9da772f0587

git log 605f863173b6..a9da772f0587 --date=short --no-merges --format='%ad %ae %s'
2019-08-27 chrisforbes@google.com Pass draw-to-draw varying state directly to Renderer::draw
2019-08-27 chrisforbes@google.com Do not expose extensions for KHR_shader_draw_parameters and KHR_variable_pointers

Created with:
  gclient setdep -r src/third_party/swiftshader@a9da772f0587

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_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/132280877
Change-Id: I5b0f1ded5be153b46704afe4630a948c8aed9334
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773339Reviewed-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@{#690803}

DEPS

@@ -178,7 +178,7 @@ 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': '605f863173b69f9cbe40fca2ac1853eb299e8856',
+  'swiftshader_revision': 'a9da772f0587a3b1dd789dad3d1846c9e5769771',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.