For #11044 - Sets the anchorView of the snackbar to be the new tab fab

[boek]

Pull Request checklist

• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features. In addition, it includes a screenshot of a successful accessibility scan to ensure no new defects are added to the product.

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[boek]

@AmyYLee With both the snackbar and the fab visible at the same time it you can tell that they are two different shades of purple. Is this okay?

[darkwing]

I'm cool with this. We also need to do this for close all, save to collection, etc.

[AmyYLee]

@AmyYLee With both the snackbar and the fab visible at the same time it you can tell that they are two different shades of purple. Is this okay?

@boek @darkwing Hi, these are actually suppose to be the same colour, Violet 50 (#9059ff). This applies to all buttons, toggles, and snackbars in dark theme. We only use Violet 40 (#AB71FF) on text links in dark theme. Thanks!