Roll ANGLE from 137271ffc54d to bb7660008b16 (2 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/137271ffc54d..bb7660008b16

2021-01-21 timvp@google.com Vulkan: Move Flush during SyncHelper::clientWait() earlier
2021-01-21 syoussefi@chromium.org Translator: Stop allocating TIntermSequence

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 cnorthrop@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:1060139
Tbr: cnorthrop@google.com
Test: Test: CopyOutputScalingPixelTest.ScaledCopyOfDrawnFrame/48
Change-Id: I214048bd0724c4c4e073eb9e9910bfedf7b2f2fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641484Reviewed-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@{#845557}

DEPS

@@ -211,7 +211,7 @@ 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': '137271ffc54d5c23cc96e7d5624c3f8648f77091',
+  'angle_revision': 'bb7660008b16bd0fea2bf114075aece585fbe1f1',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.