Roll src/third_party/angle ad77f55e0183..4c118cb3d371 (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/ad77f55e0183..4c118cb3d371

git log ad77f55e0183..4c118cb3d371 --date=short --no-merges --format='%ad %ae %s'
2019-08-02 hckim.kim@samsung.com Vulkan: Add support for OES_vertex_half_float
2019-08-02 timvp@google.com Vulkan: Implement framebuffers without attachments

Created with:
  gclient setdep -r src/third_party/angle@4c118cb3d371

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=geofflang@google.com

Bug: None
Change-Id: I4b8fa77e01dd6c23428ed6c4d35743a3011cdd8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733413Reviewed-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@{#683756}

DEPS

@@ -157,7 +157,7 @@ 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': 'ad77f55e018305e7faaa455583a225a26c77da13',
+  'angle_revision': '4c118cb3d3717437764f0d3c35fbca6b709e4b50',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.