Roll src/third_party/angle e49df747da7e..755417dd7907 (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/e49df747da7e..755417dd7907

git log e49df747da7e..755417dd7907 --date=short --no-merges --format='%ad %ae %s'
2019-10-01 jaime@janeasystems.com GLES2: Use require_constant_initialization for g_Mutex
2019-10-01 cnorthrop@google.com Vulkan: Narrow skip lists for 3D and 2DArray tests to Compute

Created with:
  gclient setdep -r src/third_party/angle@755417dd7907

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:3188,chromium:3189,chromium:3810
Change-Id: I4f4960b14c2c4373ca1f8bebed2921d2e3150ca3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833905Reviewed-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@{#701637}

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': 'e49df747da7ebdfac05da253e769ac4f0912f62b',
+  'angle_revision': '755417dd79071d6149c81418e1404b0c61d19672',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.