Roll ANGLE from 5a4af4624777 to 08c4d09493bf (8 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/5a4af4624777..08c4d09493bf

2020-07-18 kbr@chromium.org Improve WebGL 2.0 readPixels support.
2020-07-17 courtneygo@google.com Vulkan: Fix RTs attached to textures with non-0 mip
2020-07-17 ianelliott@google.com Vulkan: FramebufferVk::clearImpl() break-RP fix
2020-07-17 lehoangq@gmail.com Metal: Enable dEQP GLES2 tests on AMD.
2020-07-17 jmadill@chromium.org Perf Tests: Make "offscreen" a common test param.
2020-07-17 xinyi.he@arm.com Fix ContextLostTest if robustness ext is disabled
2020-07-17 syoussefi@chromium.org Enable fixed swiftshader tests
2020-07-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll VK-GL-CTS from 8726fda3f865 to 30aa06f22718 (5 revisions)

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 jonahr@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: jonahr@google.com
Change-Id: I14c26d2665729a4762c4ccaed4ef6dc393958964
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2305714Reviewed-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@{#789781}

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': '5a4af4624777b0cd91d299eeeb13222414607f1b',
+  'angle_revision': '08c4d09493bf22418d7eb75dd936ada79095e088',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.