Roll src/third_party/angle 4b80fbc8f94a..f321db9a8ea2 (4 commits)

https://chromium.googlesource.com/angle/angle.git/+log/4b80fbc8f94a..f321db9a8ea2

git log 4b80fbc8f94a..f321db9a8ea2 --date=short --first-parent --format='%ad %ae %s'
2019-12-19 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/spirv-tools/src 38d7fbaad0a3..e70b009b0f1e (1 commits)
2019-12-19 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/SwiftShader 21be09d8e699..4fd7fccd6db5 (4 commits)
2019-12-19 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/vulkan-validation-layers/src 2b19f3916726..e8e8f32d1b7a (4 commits)
2019-12-19 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/vulkan-tools/src 9c5719ab7149..246503e9c085 (1 commits)

Created with:
  gclient setdep -r src/third_party/angle@f321db9a8ea2

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/+/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
Bug: None
Tbr: jmadill@google.com
Change-Id: I587fc36de24b668a94bb03d7ba525461e195fa47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974927Reviewed-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@{#726328}

DEPS

@@ -187,7 +187,7 @@ 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': '4b80fbc8f94ade50055dc72047c545ad2812639e',
+  'angle_revision': 'f321db9a8ea209392a9c6829603e51fb88825f9d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.