Roll WebGL aef0b3a..7c0541d

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/aef0b3a..7c0541d

Bug: 804118, 818336, 828262, angleproject:2381
Tbr: zmo@chromium.org, kainino@chromium.org, jdarpinian@chromium.org
Cq-Include-Trybots: luci.chromium.try:win_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_angle_rel_ng;luci.chromium.try:win_angle_rel_ng
Change-Id: I28b3d55e43f5633ffe4c8cd6e7e375dd2fba2b9b
Reviewed-on: https://chromium-review.googlesource.com/1010910Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550408}

DEPS

@@ -947,7 +947,7 @@ deps = {
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',
 
   'src/third_party/webgl/src':
-    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'aef0b3a79983db6f553f35f6ccd7b9303a72d2fa',
+    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '7c0541da63f571512c49758cbc0767117997a270',
 
   'src/third_party/webrtc':
     Var('webrtc_git') + '/src.git' + '@' + '3ef3bfc2aafa707985c9e9dcd4cfb6ccbc525628', # 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 aef0b3a79983db6f553f35f6ccd7b9303a72d2fa
+Current webgl revision 7c0541da63f571512c49758cbc0767117997a270