Roll src/third_party/angle bcf9cf89aea5..b868861c3478 (3 commits)

https://chromium.googlesource.com/angle/angle.git/+log/bcf9cf89aea5..b868861c3478

git log bcf9cf89aea5..b868861c3478 --date=short --no-merges --format='%ad %ae %s'
2019-11-22 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/SwiftShader f2c9ce1e08ed..131a1ba8d06a (14 commits)
2019-11-22 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/glslang/src f4d4668529f1..43fe7bafb14e (1 commits)
2019-11-22 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/vulkan-validation-layers/src 53902309eda9..5efc3922e3e8 (1 commits)

Created with:
  gclient setdep -r src/third_party/angle@b868861c3478

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 courtneygo@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=courtneygo@google.com

Bug: chromium:None,chromium:None,chromium:None
Change-Id: Ice0e0d811f83b088667034e747be1f9dc42313f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930490Reviewed-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@{#718109}

DEPS

@@ -184,7 +184,7 @@ 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': 'bcf9cf89aea53f983d55e1d2eab05877f06424c0',
+  'angle_revision': 'b868861c3478a8a71db49abedd74704d4bb718c0',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.