Roll ANGLE from 8956bfb9c99d to 559d54d0807e (4 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/8956bfb9c99d..559d54d0807e

2020-08-10 nguyenmh@google.com Update readme with how to run regression testing script
2020-08-10 nguyenmh@google.com Change test result types + add additional logging
2020-08-10 timvp@google.com Disabling failing dEQP-GLES2.functional.fbo.render.recreate_* tests
2020-08-10 jmadill@chromium.org Vulkan: Simpify check for started RenderPass + FB.

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 ynovikov@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: ynovikov@google.com
Test: Test: dEQP-GLES2.functional.fbo.render.recreate_*
Change-Id: Ied30bf2eba31290ce8ac8d660fddc9f06daeb5f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347052Reviewed-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@{#796601}

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': '8956bfb9c99d9d810022b6054486ed3811f99cb5',
+  'angle_revision': '559d54d0807eb6d1ae98f44f3bf5c8e160a61e59',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.