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--webgl-antialiasing-mode is used to specify AA method:
  "none" -- no AA.
  "explicit" -- MSAA with explicit resolve.
  "implicit" -- MSAA with implicit resolve.
  "screenspace" -- screen space AA(CMAA).

--webgl-msaa-sample-count is used to specify the
default sample count if MSAA is currently enabled.

Bug: 849941

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;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Ia20ca291c120124f4801b08e01624c6fc28af078
Reviewed-on: https://chromium-review.googlesource.com/1075167
Commit-Queue: Jie A Chen <jie.a.chen@intel.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565923}