Roll src/third_party/angle/ 822a84b19..84fdc62c6 (8 commits)

https://chromium.googlesource.com/angle/angle.git/+log/822a84b1959f..84fdc62c6160

$ git log 822a84b19..84fdc62c6 --date=short --no-merges --format='%ad %ae %s'
2018-03-19 jiawei.shao Fix a compile error when ANGLE_D3D9EX == ANGLE_DISABLED
2017-10-03 geofflang Implement robust resource initialization for OpenGL.
2018-03-20 oetuaho Clean up checkCanBeLValue
2018-01-27 kbr Update stencil validation rules for WebGL
2018-03-19 oetuaho Rely on hash to check for some mangled name matches
2018-03-23 oetuaho Clarify aliasing rules in CHROMIUM_bind_uniform_location
2018-03-26 geofflang Check result of D3D11 map operation in Blit11::copyAndConvert.
2018-03-22 oetuaho Move ReplaceVariable to tree_util directory

Created with:
  roll-dep src/third_party/angle
BUG=chromium:693090,chromium:806557,chromium:823856,chromium:825503


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;master.tryserver.chromium.win:win_optional_gpu_tests_rel
TBR=lucferron@chromium.org

Change-Id: Ib864a0492b29de58564d5522977c11d6623dad4a
Reviewed-on: https://chromium-review.googlesource.com/981675Reviewed-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@{#545968}

DEPS

@@ -91,7 +91,7 @@ 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': '822a84b1959f9c1bb615ad4dff2569c58fb3b225',
+  'angle_revision': '84fdc62c61609d5b9b8fe7c77ce85522837549c8',
   # 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.