James Price ae0bf04ad2 msl: Default the sample mask config parameter
This is needed to roll Tint into Dawn, and makes sense for this to be
optional anyway.

Bug: tint:387
Change-Id: Ia3a42f8add36dfba954dd0a5e06f2f84d8e95464
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/55684
Commit-Queue: James Price <jrprice@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Auto-Submit: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
2021-06-22 22:57:09 +00:00
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