Roll ANGLE from 2296e7afd748 to 06b4fb92c569 (6 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/2296e7afd748..06b4fb92c569

2020-09-15 cclao@google.com Vulkan: Fool proof packed attachment index to vulkan and from OpenGL
2020-09-15 jmadill@chromium.org Test Runner: Re-use displays when using "bot mode".
2020-09-14 cclao@google.com Vulkan: Defer glFlush issued in middle of renderpass to endRenderpass
2020-09-14 jmadill@chromium.org Test Runner: Print total test execution time.
2020-09-14 jmadill@chromium.org GN: Componentize "Null" back-end.
2020-09-14 jmadill@chromium.org Add luci-go and mb to DEPS.

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 jmadill@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: jmadill@google.com
Change-Id: I59f4b4e46c04db4f4d56dce616509dec76189271
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2411356Reviewed-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@{#806900}

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': '2296e7afd74851bd287f46f06864b904365b05ce',
+  'angle_revision': '06b4fb92c569f8e26eeab003e2f71851c60aa429',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.