Roll ANGLE from dff47d5fdaac to c060d8d65786 (3 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/dff47d5fdaac..c060d8d65786

2020-08-20 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from c97acd1d3e07 to 0d6b4440549b (6 revisions)
2020-08-20 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SPIRV-Tools from 3434cb0b006d to a711c594b8cc (2 revisions)
2020-08-20 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-Loader from 30b3f3857835 to 2979391e5b0c (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 cnorthrop@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: cnorthrop@google.com
Change-Id: I72addf44dd5d5eeb88731cc505038ca98d0a59f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366246Reviewed-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@{#800116}

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': 'dff47d5fdaac04d1eb9343308c903157203467ce',
+  'angle_revision': 'c060d8d65786a4cfee3e43b70476354f05987c7d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.