Roll ANGLE from c55cd6b43d55 to 637786a9a862 (7 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/c55cd6b43d55..637786a9a862

2020-10-20 cnorthrop@google.com Tests: Add Arena of Valor trace
2020-10-20 geofflang@google.com Generate CONTEXT_LOST errors on every GL call.
2020-10-20 geofflang@google.com Add Queries and Setters for resource initialization state.
2020-10-20 courtneygo@google.com Vulkan: functionally complete worker thread
2020-10-20 jmadill@chromium.org Fix missing validation cache update on VAO binding.
2020-10-20 jmadill@chromium.org Suppress timing out GLES 31 tests on GL/Linux.
2020-10-20 syoussefi@chromium.org Vulkan: Pull generic SPIR-V transform functionality into base class

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: chromium:1132514,chromium:1137241,chromium:1139398
Tbr: jonahr@google.com
Test: Test: angle_perftest --gtest_filter="*arena*"
Change-Id: I5c86409d0607b087df8fc86d0e6f5c4386b6d4a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488022Reviewed-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@{#819150}

DEPS

@@ -218,7 +218,7 @@ 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': 'c55cd6b43d55fb0ed6e59a8a5c92be82258f5587',
+  'angle_revision': '637786a9a862e617560404999b4a8800cf101f4d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.