"Autofill with Google" is unable to autofill with Google Password Manager

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Description When a user has set Google Password Manager as the preferred Android autofill service, and the user then changes Vanadium's autofill service option to "Autofill with Google", Google's Password Manager autofill dialogs are never shown when the user performs operations (signing in to a website, selecting a password field, etc) where a dialog would normally be displayed when used with Chrome.

However, it all works perfectly fine when Vanadium's autofill service option is set to "Autofill using another service".

Since the descriptive text for "Autofill with Google" mentions "Use Google Password Manager [...] to save and fill passwords", the user assumes that this is the option they must choose.

Steps to reproduce the behaviour

First, set up OS autofill with Google Password Manager:

1. Install Sandboxed Google Play
2. Go to Settings > Passwords, passkeys & accounts > Add account > Google > sign in with a Google account
3. Go to Settings > Apps > Sandboxed Google Play > All services > Autofill with Google > Follow the instructions in that screen to enable autofill
4. In the same screen, select Google Password Manager
5. If no passwords have been added, add a password. If passwords have been added previously, swipe from the top-down to force it to fetch them.

Set up autofill in Vanadium:

6. Go to Vanadium settings > Autofill services > select "Autofill with Google" and restart Vanadium
7. Visit a site for which you have saved a password in Google Password Manager and select the username or password field
8. Observe that there is no pop-up from Google Password Manager

To observe the expected behaviour of working autofill:

9. Repeat steps 6 and 7 but set Autofill services to "Autofill using another service"

Versions Pixel 8 Vanadium 131.0.6778.135 GrapheneOS 2024121200 Play services 24.47.36