gpu: Enable CMAA for all Broadwell and Braswell ChromeOS devices

Extend the GPU workaround exception list to enable CMAA on all Broadwell
and Braswell GPUs. Using CMAA in place of MSAA for WebGL gives a
performance benefit.

BUG=535198
TEST=Boot cyan and observe that workaround is no longer listed.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2165553002
Cr-Commit-Position: refs/heads/master@{#414435}
1 file changed