Roll ANGLE from edea3d95c996 to 6c3942200a20 (3 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/edea3d95c996..6c3942200a20

2020-09-23 b.schade@samsung.com Vulkan: Fix bug in compressed texel block computation
2020-09-23 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SPIRV-Tools from 125b64241909 to 67525bded1de (4 revisions)
2020-09-23 m.maiya@samsung.com Allow GL_UNSIGNED_BYTE as a type for glColorPointer

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 syoussefi@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: syoussefi@google.com
Test: Test: angle_end2end_test --gtest_filter=*ETC1CompressedImageNPOT*
Change-Id: Ib5a248374105eaccb63d69d15c722b4bd5c73877
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426254Reviewed-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@{#809983}

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': 'edea3d95c99625197acd9b1326fabd885eb5e260',
+  'angle_revision': '6c3942200a20a6609f212e9833b2bc81bdb14f59',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.