Roll src/third_party/swiftshader 4fe8eb31e4a4..dcc9fd7958e7 (3 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/4fe8eb31e4a4..dcc9fd7958e7


git log 4fe8eb31e4a4..dcc9fd7958e7 --date=short --no-merges --format='%ad %ae %s'
2019-05-03 chrisforbes@google.com Add input attachment support for VK_FORMAT_A2B10G10R10_UINT_PACK32
2019-05-03 chrisforbes@google.com Add support for VK_FORMAT_A2B10G10R10_UINT_PACK32 render targets
2019-05-03 chrisforbes@google.com Fix blitter clears of 2D views of 3D textures


Created with:
  gclient setdep -r src/third_party/swiftshader@dcc9fd7958e7

The AutoRoll server is located here: https://autoroll.skia.org/r/swiftshader-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

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

BUG=chromium:b/131171141,chromium:b/131896622,chromium:b/nnn
TBR=swiftshader-team+autoroll@chromium.org

Change-Id: I73a1d0ea26407ee5818364a8bd71c969bbbb1482
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1594815
Reviewed-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@{#656461}