Roll src/third_party/angle d84b6737fa10..3b9680534909 (4 commits)

https://chromium.googlesource.com/angle/angle.git/+log/d84b6737fa10..3b9680534909


git log d84b6737fa10..3b9680534909 --date=short --no-merges --format='%ad %ae %s'
2018-09-07 fjhenigman@chromium.org Clean up state in EGLDebugTest.
2018-09-07 jmadill@chromium.org Vulkan: Make ContextVk driver uniforms a dirty bit.
2018-09-07 jmadill@chromium.org Vulkan: Correct gl_FragCoord with default FBO.
2018-09-07 fjhenigman@chromium.org Fix ClearTest.RGB8WithMaskFramebuffer.


Created with:
  gclient setdep -r src/third_party/angle@3b9680534909

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

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

BUG=chromium:880495
TBR=fjhenigman@chromium.org

Change-Id: Ibc35a52b39df10cc9d6cab6500eff19204dca7aa
Reviewed-on: https://chromium-review.googlesource.com/1213826Reviewed-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@{#589705}

DEPS

@@ -117,7 +117,7 @@ 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': 'd84b6737fa10f9222c70b44655c382e942c5ffe6',
+  'angle_revision': '3b9680534909944560e4a12e0cce6be5943cc3e8',
   # 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.