Roll WebGL 5e83981..a5c263c

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/5e83981..a5c263c

Bug: 853978, 857303
Change-Id: I9cf554d30f5f51bcdca25f7fa6b1027312de0e77
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
Reviewed-on: https://chromium-review.googlesource.com/1117894
Reviewed-by: Kenneth Russell <[email protected]>
Commit-Queue: James Darpinian <[email protected]>
Cr-Commit-Position: refs/heads/master@{#571327}
3 files changed