Roll ANGLE from f46e6201b40b to 620cb770e3dd (6 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/f46e6201b40b..620cb770e3dd

2020-11-13 syoussefi@chromium.org Fix texture buffer unbind and size query
2020-11-13 senorblanco@chromium.org Wrap a paragraph in DevSetup docs to 100 chars.
2020-11-13 senorblanco@chromium.org Fix some apostrophes, because I'm possessive like that.
2020-11-13 timvp@google.com Vulkan: Suppress VkSubpassDescriptionDepthStencilResolve
2020-11-13 timvp@google.com Add test running flag: --delay-test-start
2020-11-13 senorblanco@chromium.org Fix EGL_ANGLE_platform_extension* filenames in DevSetup docs.

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
Test: Test: KHR-GLES31.core.texture_buffer.texture_buffer_parametersTest: Test: dEQP-GLES31.functional.texture.texture_buffer.state_query.texture_buffer_size_integer
Change-Id: I16f60b0dabd54a7092c51e8a32d8f45f2f00144b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537054Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827980}

DEPS

@@ -209,7 +209,7 @@ 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': 'f46e6201b40bdee3e0b79d5d97660fc302fd76f5',
+  'angle_revision': '620cb770e3dd506be78103e362cfdab96fd2dca4',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.