Roll ANGLE from e56466d4848c to ef897a9c3ec2 (3 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/e56466d4848c..ef897a9c3ec2

2020-10-05 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from 375fee944c76 to b3c1e71eb1cb (2 revisions)
2020-10-05 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SPIRV-Tools from d91afd8de27a to f15133788010 (3 revisions)
2020-10-05 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-Headers from e1ba543c6789 to 94ff600cc862 (1 revision)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/angle-chromium-autoroll
Please CC timvp@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_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win-asan;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: timvp@google.com
Change-Id: If1a34d4f5e19a1a9280908a1f0f4d77b0546f3cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449635Reviewed-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@{#813724}

DEPS

@@ -207,7 +207,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.
-  'angle_revision': 'e56466d4848c6d955ca24d6a99eb90cba74d3f3a',
+  'angle_revision': 'ef897a9c3ec2c0b43a2192efcad31accc55b5bbe',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.