Roll src/third_party/angle 515f9bebd1f8..6e687af2649d (1 commits)

https://chromium.googlesource.com/angle/angle.git/+log/515f9bebd1f8..6e687af2649d

git log 515f9bebd1f8..6e687af2649d --date=short --no-merges --format='%ad %ae %s'
2019-11-14 geofflang@chromium.org Support standalone Android builds in ANGLE.

Created with:
  gclient setdep -r src/third_party/angle@6e687af2649d

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 cnorthrop@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=cnorthrop@google.com

Bug: None
Change-Id: I71e174b6740315998b1c29372ca273a3272c9f3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1916631Reviewed-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@{#715298}

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': '515f9bebd1f8808fb1763b802e5cd3b467063ebb',
+  'angle_revision': '6e687af2649d48aa66b020fab4057ac85191dd8b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.