Roll WebGL 98a3d3b..a182a9a

TBR=jmadill@chromium.org

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/98a3d3b..a182a9a

Cq-Include-Trybots: master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.angle:linux_angle_rel_ng;master.tryserver.chromium.angle:win_angle_rel_ng
Change-Id: Ia2dff519f9b9c8f28bb494a2ea825f0f3e7330f3
Reviewed-on: https://chromium-review.googlesource.com/904858Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534779}

DEPS

@@ -649,7 +649,7 @@ deps = {
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',
 
   'src/third_party/webgl/src':
-    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '98a3d3b4355644bb1187a858fdd2aff6b2bc84ec',
+    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'a182a9ad3078aca566d8355eabf2d9f56f70ee82',
 
   'src/third_party/webrtc':
     Var('webrtc_git') + '/src.git' + '@' + '29f14322d13e126c1c9cab0d3bf874bd2a652fdb', # commit position 21742

content/test/gpu/gpu_tests/webgl_conformance_revision.txt

 # AUTOGENERATED FILE - DO NOT EDIT
 # SEE roll_webgl_conformance.py
-Current webgl revision 98a3d3b4355644bb1187a858fdd2aff6b2bc84ec
+Current webgl revision a182a9ad3078aca566d8355eabf2d9f56f70ee82