Roll src/third_party/angle 8dfc2b05d987..4b53273c1292 (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/8dfc2b05d987..4b53273c1292

git log 8dfc2b05d987..4b53273c1292 --date=short --first-parent --format='%ad %ae %s'
2019-11-25 courtneygo@google.com Vulkan: Fix validation issue with swiftshader
2019-11-25 flibitijibibo@gmail.com Implement BaseVertex draw calls for Vulkan, OpenGL, NULL contexts.

Created with:
  gclient setdep -r src/third_party/angle@4b53273c1292

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/angle-chromium-autoroll
Please CC cwallez@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

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
Bug: None
Tbr: cwallez@google.com
Change-Id: I7556c6207eb87ede82e65f9fb3b109e03dc8213c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935435Reviewed-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@{#718952}

DEPS

@@ -184,7 +184,7 @@ 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': '8dfc2b05d9871274779c56d8c5dec3399f97ee55',
+  'angle_revision': '4b53273c1292fed4532ff46aeecb1f53eb595069',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.