Update WebGL 2 test expectations.

Un-skip a few tests.

BUG=
TEST=GPU FYI bots
TBR=kbr@chromium.org
NOTRY=true
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.win:win_optional_gpu_tests_rel

Review URL: https://codereview.chromium.org/1874463002

Cr-Commit-Position: refs/heads/master@{#385935}
1 file changed