Roll src/third_party/angle a131a1515471..76a9a97fb2a1 (3 commits)

https://chromium.googlesource.com/angle/angle.git/+log/a131a1515471..76a9a97fb2a1


git log a131a1515471..76a9a97fb2a1 --date=short --no-merges --format='%ad %ae %s'
2019-04-10 jmadill@chromium.org Minor update to auto-roller infra docs.
2019-04-10 syoussefi@chromium.org Vulkan: update GLES3 and EGL expectations
2019-04-10 spang@chromium.org Vulkan: Expose GL_EXT_memory_object_fd & GL_EXT_semaphore_fd


Created with:
  gclient setdep -r src/third_party/angle@76a9a97fb2a1

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

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=ynovikov@chromium.org

Change-Id: I2cbcea5d05ee43cde8390f346b2bf8253097c2a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1562035Reviewed-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@{#649592}

DEPS

@@ -141,7 +141,7 @@ 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': 'a131a1515471571ec058e8940c0de1bdad2a0060',
+  'angle_revision': '76a9a97fb2a19a325ef90c10900718bfbdb4b1d3',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.