Roll ANGLE from 9100465414a9 to 5ac807b26749 (8 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/9100465414a9..5ac807b26749

2020-08-28 cclao@google.com Vulkan: Let stageSubresourceUpdateAndGetData use ctx staging buffer
2020-08-28 jmadill@chromium.org Enable -Wreturn-std-move-in-c++11.
2020-08-28 jmadill@chromium.org Enable -Wbad-function-cast.
2020-08-28 timvp@google.com Add third_party/abseil-cpp to ANGLE
2020-08-28 cclao@google.com Vulkan: Fix alignment issue with context staging buffer
2020-08-28 lehoangq@gmail.com Metal: Fix handling of vertex attrib offset not multiple of 4
2020-08-28 jmadill@chromium.org Enable two override suggestion warnings.
2020-08-28 cnorthrop@google.com Capture/Replay: Track groups of strings

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 courtneygo@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: courtneygo@google.com
Test: Test: Manhattan MEC works again
Change-Id: Ic6832b238622ddf56538b74026ca8185cb59a9df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382699Reviewed-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@{#802871}

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': '9100465414a995f418914fdad0503e06ea951266',
+  'angle_revision': '5ac807b267493118d5184fbe4ef9cabcbbb77944',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.