Roll src/third_party/angle e4634a13a74d..778bf09deea4 (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/e4634a13a74d..778bf09deea4


git log e4634a13a74d..778bf09deea4 --date=short --no-merges --format='%ad %ae %s'
2018-11-16 jmadill@chromium.org Auto-generate validation headers.
2018-11-16 syoussefi@chromium.org Vulkan: Emulate Luminance/Alpha with R8G8B8A8


Created with:
  gclient setdep -r src/third_party/angle@778bf09deea4

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=cwallez@chromium.org

Change-Id: I7e8a4bf7dd083edeaf6e380ff7c9a8d5e05660f5
Reviewed-on: https://chromium-review.googlesource.com/c/1340578Reviewed-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@{#609020}

DEPS

@@ -128,7 +128,7 @@ 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': 'e4634a13a74de80a9fd3cddee38082846d1955df',
+  'angle_revision': '778bf09deea44363f5b9aa5a8795e264936099c3',
   # 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.