Roll src/third_party/angle 2c5d48a6f0e4..f0640bc3c1dc (5 commits)

https://chromium.googlesource.com/angle/angle.git/+log/2c5d48a6f0e4..f0640bc3c1dc

git log 2c5d48a6f0e4..f0640bc3c1dc --date=short --no-merges --format='%ad %ae %s'
2019-08-30 lujc@google.com Use SemaphoreID in place of GLuint handle
2019-08-30 jmadill@chromium.org Update docs on enum names.
2019-08-30 jmadill@chromium.org Vulkan: Generalize ICD decision for loader.
2019-08-30 syoussefi@chromium.org Vulkan: Make vk::ImageView pointers const
2019-08-30 jmadill@chromium.org Vulkan: Move loader defines into BUILD.gn.

Created with:
  gclient setdep -r src/third_party/angle@f0640bc3c1dc

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@chromium.org 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
TBR=cwallez@chromium.org

Bug: None
Change-Id: Ica8705de6f9572ee22ac62c6d22d5be48900775b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779366Reviewed-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@{#692322}

DEPS

@@ -174,7 +174,7 @@ 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': '2c5d48a6f0e43c5a688ad85716f318ca1a9e957e',
+  'angle_revision': 'f0640bc3c1dc3a807f90ec914a3b2106727fc9aa',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.