Roll src/third_party/angle 6acfca3ad3e3..2682b5a02d16 (3 commits)

https://chromium.googlesource.com/angle/angle.git/+log/6acfca3ad3e3..2682b5a02d16

git log 6acfca3ad3e3..2682b5a02d16 --date=short --no-merges --format='%ad %ae %s'
2019-10-07 jmadill@chromium.org Documentation maintenance.
2019-10-07 jmadill@chromium.org Roll angle-internal with new GLES 1.0 fixes.
2019-10-07 bsheedy@chromium.org Reland "Add export_targets.py to presubmit"

Created with:
  gclient setdep -r src/third_party/angle@2682b5a02d16

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 geofflang@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=geofflang@google.com

Bug: chromium:1003151
Change-Id: Id27d80e406b89e10d16f78df9a971be67deb2d41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845702Reviewed-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@{#703501}

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': '6acfca3ad3e322638970a6301f39f5b4262a0cdd',
+  'angle_revision': '2682b5a02d16d03094e579fea17c802b23999251',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.