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Added --canvas-msaa-sample-count and --gpu-rasterization-msaa-sample-count
in the list of switches allowed in the WebEngine config. These flags are
useful to turn off MSAA, which may be required to save memory.

Bug: fuchsia:43693
Change-Id: Ib519cc7bede46a5ff7879d1a9678fbf88e33de2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040200
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738719}