Roll ANGLE from b369376270f8 to 6169aca6f508 (2 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/b369376270f8..6169aca6f508

2020-06-01 jmadill@chromium.org Update dirty bits flow example.
2020-06-01 plamoureux@google.com Move ShaderVariable utility function from utilities.cpp ShaderVars.cpp.

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 ynovikov@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: ynovikov@google.com
Change-Id: I447f2ba857842dca3ea293d2dbf4315d35b2efb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225436Reviewed-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@{#773829}

DEPS

@@ -190,7 +190,7 @@ 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': 'b369376270f848bd1ce8aaf98c642a84d680fc4f',
+  'angle_revision': '6169aca6f50881c3ebae7df23a60f35ffbe9b958',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.