Streamline importing passwords from Google

[CDRussell]

Task/Issue URL: https://app.asana.com/1/137249556945/project/608920331025315/task/1211197010246726?focus=true

Description

Streamlines the web flow for importing passwords from Google; when prompted for the 2nd / nth time for password re-entry these are re-authenticated automatically using autofill.

Steps to test this PR

Fresh install, manual password entry

• Fresh install from this branch as an internal build type
• Launch Autofill Dev Settings-> Launch Google Passwords (import flow)
• Enter your username / Google email address
• Type your password (or copy/paste.. just don't use our autofill) and hit next button
• Verify: automation takes over for the rest of the flow and import happens successfully

Immediately import again, manual password entry

• Tap Launch Google Passwords (import flow) again
• Verify: password is not automatically autofilled
• Type your password (or copy/paste.. just don't use our autofill) and hit next button
• Verify: automation takes over for the rest of the flow and import happens successfully (will show 0 passwords imported since they'll be duplicates)

Using our autofill

• Tap on View saved logins and manually enter your Google username and password with google.com for the URL
• Save and return to autofill dev settings
• Tap on Google Account Logout
• Launch Autofill Dev Settings-> Launch Google Passwords (import flow)
• Choose your username (which will likely be remembered)
• Verify you are prompted to autofill your password (and accept)
• Verify: automation takes over for the rest of the flow and import happens successfully

Feature flag disabled

• Launch feature flag inventory and disable canReAuthenticateGoogleLoginsAutomatically
• Return to autofill dev settings, tap Google Account Logout and Delete all saved logins to clear state
• Tap on Launch Google Passwords (import flow)
• Choose your username (which will likely be remembered)
• Type your password (or copy/paste) and hit next button
• Verify: automation happens only up to password prompt

[CDRussell]

• Streamline importing passwords from Google #6746 👈 (View in Graphite)
• develop

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[CDRussell]

These will get a stable release before we merge

[cmonfortep]

Just some comments around test cases and some tidy up of classes. The core part looks good.

Tested on an emulator and found some issues (will attach video on the task), on my real device worked well.

[CDRussell]

Tested on an emulator and found some issues

We followed up on that elsewhere; issue was that the emulator was set to destroy activities as soon as you leave them.

I've addressed the feedback, and made a commit setting the default value of the feature flag to be enabled. One last thing I'm waiting for before I merge is a release of c-s-s library.