Roll ANGLE from a1ecebbc8338 to 7870cf3f0a34 (4 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/a1ecebbc8338..7870cf3f0a34

2020-09-11 syoussefi@chromium.org Vulkan: Fix RAW hazard with storage images
2020-09-11 geofflang@google.com Flush less frequently in QueryGL.
2020-09-11 courtneygo@google.com Vulkan: Use current commandBuffer pointer
2020-09-11 courtneygo@google.com Enable precision qualifiers.

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 ianelliott@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: chromium:1078754
Tbr: ianelliott@google.com
Change-Id: I369e397e2d5f3ded08991272e302918c6f4a6c33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404618Reviewed-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@{#806320}

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': 'a1ecebbc833874ae4e478b14ea8cdc3db1fdd957',
+  'angle_revision': '7870cf3f0a3475e223c5acc02d0bab98f9da6064',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.