Roll src/third_party/angle/ 31d3deb41..b1e913801 (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/31d3deb41a44..b1e913801502

$ git log 31d3deb41..b1e913801 --date=short --no-merges --format='%ad %ae %s'
2018-05-17 jiawei.shao ES31: Implement EXT_geometry_shader framebuffer default layers on OpenGL
2018-05-21 tobine Roll fwd ANGLE chromium DEPs

Created with:
  roll-dep src/third_party/angle


The AutoRoll server is located here: https://angle-chromium-roll.skia.org

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


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=lucferron@chromium.org

Change-Id: Ib4f012780e50a0ea171015ada59b33ffe4d7e329
Reviewed-on: https://chromium-review.googlesource.com/1069841
Commit-Queue: angle-chromium-autoroll <angle-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: angle-chromium-autoroll <angle-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#560943}

DEPS

@@ -108,7 +108,7 @@ 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': '31d3deb41a44a74f8c730484d9a36b886172dbb3',
+  'angle_revision': 'b1e913801502c7380d68d0101e4399f4550f4dc3',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.