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MSAA is too expensive on these GPUs. At least for the time being, use
the CMAA extension wherever it's supported.

BUG=535198, 768400

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;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
Change-Id: I3e5da867cbfcfdc08113949e7d93c5662e4ad115
Reviewed-on: https://chromium-review.googlesource.com/701922
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506925}