Roll SwiftShader from 4804ac8724ff to e6dc3d37f58c (3 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/4804ac8724ff..e6dc3d37f58c

2020-11-12 zzyiwei@google.com Disable VK_KHR_external_memory_fd for Android build
2020-11-12 natsu@google.com Handle image properties from external device memory
2020-11-12 capn@google.com Fix conditionally enabling Reactor MSan instrumentation

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: I50a14f8d0551f6d685ccbc43ff2f16288bdba687
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533164Reviewed-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@{#826996}

DEPS

@@ -213,7 +213,7 @@ 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': '4804ac8724ff42f0750def99a17ff929cff92d7f',
+  'swiftshader_revision': 'e6dc3d37f58c00c8818742cc27a69f793bea5672',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.