Re-enable GPU raster and HW canvas on 10.13.4 and above

The stability issues in 10.13's earlier releases appear to have been
fixed in 10.13.4.

Bug: 773705
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
Change-Id: Ib483847c6b8b8779448b6d47d5ab3cd6a72d2c34
Reviewed-on: https://chromium-review.googlesource.com/1011252
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550544}
1 file changed