Roll src/third_party/angle 2f71802b4404..6f23b4b7038e (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/2f71802b4404..6f23b4b7038e

git log 2f71802b4404..6f23b4b7038e --date=short --no-merges --format='%ad %ae %s'
2019-10-28 mmynttinen@mozilla.com Fix MinGW include: s/VersionHelpers.h/versionhelpers.h/
2019-10-28 jmadill@chromium.org Plumb more logic for ANGLE_get_image.

Created with:
  gclient setdep -r src/third_party/angle@6f23b4b7038e

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/+/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=ynovikov@google.com

Bug: None
Change-Id: I0b9f56f367af32ecfc33c760647258f8e15570ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884527Reviewed-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@{#710134}

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': '2f71802b4404331ecb8f86d6691097479e6b29ae',
+  'angle_revision': '6f23b4b7038e0b5baa75db310c1988a7b85f1a3a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.