VisualTests:Toggle Snapshot

Build 300 on matt/ap-3440-add-toggle-to-show-baseline-snapshot-image
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Baseline History
Build 3008441906
Current build. There are unaccepted changes, so build 237 is still the baseline.
Build 237015b629 current baseline
Accepted by Matthew Weeks.
Commenting is disabled because there's a newer build on this branch