Roll src/third_party/angle 776694cdad40..7b08d381fd67 (4 commits)

https://chromium.googlesource.com/angle/angle.git/+log/776694cdad40..7b08d381fd67


git log 776694cdad40..7b08d381fd67 --date=short --no-merges --format='%ad %ae %s'
2019-05-10 syoussefi@chromium.org Vulkan: Enable EXT_frag_depth
2019-05-10 syoussefi@chromium.org Vulkan: Support flat and centroid qualifiers
2019-05-10 syoussefi@chromium.org Vulkan: fix qualifier erase for unused vertex attributes
2019-05-10 syoussefi@chromium.org Vulkan: Implement EXT_draw_buffers


Created with:
  gclient setdep -r src/third_party/angle@7b08d381fd67

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=jonahr@google.com

Change-Id: Icf26c4cdc0bfa505b8da6e8a7c5bbe070e12cffb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1605468Reviewed-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@{#658453}

DEPS

@@ -145,7 +145,7 @@ 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': '776694cdad40eea42df37eea7e73cacbd940569b',
+  'angle_revision': '7b08d381fd676d2e37d20442f7d9389afeb8b3d8',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.