Roll src/third_party/swiftshader bfbdd89d1149..6a12e092091c (3 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/bfbdd89d1149..6a12e092091c


git log bfbdd89d1149..6a12e092091c --date=short --no-merges --format='%ad %ae %s'
2019-04-30 capn@google.com Refactor image array layer addressing
2019-04-30 capn@google.com Implement OpImageSampleExplicitLod with Grad operand
2019-04-30 capn@google.com Marshal image instruction parameters to the sampling trampoline


Created with:
  gclient setdep -r src/third_party/swiftshader@6a12e092091c

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/129523279,chromium:b/129523279,chromium:b/129523279
TBR=swiftshader-team+autoroll@chromium.org

Change-Id: Icc07b21cc9a3ef85e9905b2b42e67bc842934fd1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1589158
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@{#655140}
diff --git a/DEPS b/DEPS
index 99f5db8..11943de 100644
--- a/DEPS
+++ b/DEPS
@@ -149,7 +149,7 @@
   # 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': 'bfbdd89d1149539bc8845a9f67612e71c24cff5f',
+  'swiftshader_revision': '6a12e092091cad34a9ff125f71cf7b8c702fd65c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.