Roll ANGLE from 4c7e3ee345c3 to 709472c9dd0c (6 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/4c7e3ee345c3..709472c9dd0c

2020-08-04 m.maiya@samsung.com Vulkan: Fix variable scope bug during vkCreateInstance
2020-08-03 jmadill@chromium.org Vulkan: Add an overlay counter for descriptor writes.
2020-08-03 jmadill@chromium.org Vulkan: Move Resource Serial gen into Renderer.
2020-08-03 jmadill@chromium.org Trace Tests: Disable timestamp queries.
2020-08-03 jonahr@google.com Metal: Enable EGL_KHR_surfaceless_context.
2020-08-03 nguyenmh@google.com Add vertex array serialization capability

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 geofflang@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: geofflang@google.com
Change-Id: I61df037e5b57fe2cbc1c6b1a3516736053404134
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335830Reviewed-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@{#794360}

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': '4c7e3ee345c370be7c23a62f567f1f3267b9c7b0',
+  'angle_revision': '709472c9dd0c413ceb944e06afb600d741e63720',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.