Roll SwiftShader from 3549479dc4cc to c4a1bd4553ff (4 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/3549479dc4cc..c4a1bd4553ff

2021-01-13 amaiorano@google.com Implement VK_EXT_headless_surface
2021-01-13 natsu@google.com Update AHB default YUV dataspace to YCBCR_601
2021-01-13 capn@google.com VulkanBenchmarks: refactor into Image class
2021-01-13 capn@google.com Fix back-face culling for vertices near w=0

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/+doc/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: I38c6d95c313d6374711f804af228977cd6a7a57c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627814Reviewed-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@{#843322}

DEPS

@@ -215,7 +215,7 @@ 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': '3549479dc4ccd92ef3b9e179080dcec1a430b01d',
+  'swiftshader_revision': 'c4a1bd4553ff61f771ce240a2b7033a02d4e5325',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.