Roll src/third_party/angle/ d8ffd7561..9aef36705 (4 commits)

https://chromium.googlesource.com/angle/angle.git/+log/d8ffd75616c1..9aef36705b66

$ git log d8ffd7561..9aef36705 --date=short --no-merges --format='%ad %ae %s'
2018-04-27 jmadill Vulkan: Implement masked color clears.
2018-04-27 jmadill Vulkan: Take serials in PipelineDesc::updateShaders.
2018-04-30 jmadill Fix ASSERT macro generating extra code in MSVC.
2018-05-01 jmadill Vulkan: Use ShaderType enum.

Created with:
  roll-dep src/third_party/angle


The AutoRoll server is located here: https://angle-chromium-roll.skia.org

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


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

Change-Id: If65ea4ed2a0025e44dc6f098d0a081bd85db3033
Reviewed-on: https://chromium-review.googlesource.com/1040352Reviewed-by: angle-chromium-autoroll <angle-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: angle-chromium-autoroll <angle-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#555543}

DEPS

@@ -108,7 +108,7 @@ 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': 'd8ffd75616c104948ad314ea958853291fc0f79c',
+  'angle_revision': '9aef36705b6653d61fee7e79dac188c279bff5ed',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.