Roll src/third_party/angle 66aae7e647fd..9122bec28506 (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/66aae7e647fd..9122bec28506

git log 66aae7e647fd..9122bec28506 --date=short --no-merges --format='%ad %ae %s'
2019-10-22 mihu@microsoft.com Fix EXT_multisample_render_to_texture perf regression
2019-10-22 jmadill@chromium.org Metal: Move ldflags to Metal backend config.

Created with:
  gclient setdep -r src/third_party/angle@9122bec28506

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/+/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_optional_gpu_tests_rel
TBR=jonahr@google.com

Bug: chromium:1015031,chromium:1014228
Change-Id: I347f991a0a19706680cb3c47bfd9357dc66d7ac0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872320Reviewed-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@{#708266}

DEPS

@@ -179,7 +179,7 @@ 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': '66aae7e647fdcdd1a8e7b1ab0e4977fa5e071b56',
+  'angle_revision': '9122bec28506ddefc46974c0d210382a9881aaf0',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.