Roll src/third_party/angle 5549ef0451f9..5a42da564fbe (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/5549ef0451f9..5a42da564fbe

git log 5549ef0451f9..5a42da564fbe --date=short --no-merges --format='%ad %ae %s'
2019-10-04 angle-autoroll@skia-public.iam.gserviceaccount.com Roll ./third_party/spirv-tools/src 44b32176ee48..8fa0f1a6567c (4 commits)
2019-10-04 angle-autoroll@skia-public.iam.gserviceaccount.com Roll ./third_party/glslang/src 7bc047326e06..135e3e35ea87 (1 commits)

Created with:
  gclient setdep -r src/third_party/angle@5a42da564fbe

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
TBR=cwallez@google.com

Bug: chromium:None,chromium:None
Change-Id: I0280dcc3a4935305a02352470c65a90c1f641fb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838984Reviewed-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@{#702773}

DEPS

@@ -179,7 +179,7 @@ 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': '5549ef0451f99eb1a76eec23017582548088e99e',
+  'angle_revision': '5a42da564fbea81aa7c6943ca30bb69ed295cc3b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.