Roll src/third_party/angle b9b1bae4effb..3f647b1bf9a4 (1 commits)

https://chromium.googlesource.com/angle/angle.git/+log/b9b1bae4effb..3f647b1bf9a4

git log b9b1bae4effb..3f647b1bf9a4 --date=short --no-merges --format='%ad %ae %s'
2019-11-12 jmadill@chromium.org Vulkan: Improve Bresenham line emulation.

Created with:
  gclient setdep -r src/third_party/angle@3f647b1bf9a4

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 cnorthrop@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=cnorthrop@google.com

Bug: None
Change-Id: Ia807404e27e41ae8b7ec74db796be455a17ca2e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910797Reviewed-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@{#714534}

DEPS

@@ -180,7 +180,7 @@ 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': 'b9b1bae4effb7002133da1964fd893e0d8cb9790',
+  'angle_revision': '3f647b1bf9a476adb1af5037b88ef7403eb73e31',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.