Roll src/third_party/swiftshader 7b29abfc486e..e7ce4e53915d (2 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/7b29abfc486e..e7ce4e53915d

git log 7b29abfc486e..e7ce4e53915d --date=short --first-parent --format='%ad %ae %s'
2019-11-25 cwallez@chromium.org Make GN builds produce an ICD JSON in the build dir
2019-11-25 chrisforbes@google.com Add missing vkCmdSetLineStippleEXT function

Created with:
  gclient setdep -r src/third_party/swiftshader@e7ce4e53915d

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
Bug: chromium:b/144183516
Tbr: swiftshader-team+autoroll@google.com
Change-Id: I9b50cfa7472122c874b301de66332e4173a0196d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934609Reviewed-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@{#718867}

DEPS

@@ -188,7 +188,7 @@ 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': '7b29abfc486e08c916efbb33a97be2e0a4d1ce9c',
+  'swiftshader_revision': 'e7ce4e53915d026720005ca2c1831a5c28f77b3f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.