Enable Google Sign In, Nightly Desktop

[ShivanKaul]

No description provided.

[kjozwiak]

Approving & Merging into main so QA can start checking the above on staging before uplifting into production on Nightly.

[kjozwiak]

Verification PASSED on Win 11 x64 using the following STR/Cases:

Nightly - BraveGoogleSignInPermissionStudy:Enabled

Brave | 1.51.13 Chromium: 111.0.5563.50 (Official Build) nightly (64-bit)
-- | --
Revision | 39f3dfc5023fe60997adc4f6cf5439cfa3e6968a-refs/branch-heads/5563@{#903}
OS | Windows 11 Version 22H2 (Build 22621.1265)

Using the information and STR/Cases mentioned via brave/brave-core#16595, went through the following and ensured that BraveGoogleSignInPermissionStudy:Enabled was being enabled via brave://version and the Allow use of third-party cookies for legacy Google Sign-In permission was appearing on websites mentioned via https://docs.google.com/spreadsheets/d/1323Jfy5l1Iotcvv2hdzW-HTSz7A0698wM9XFbdICVjw.

• downloaded/installed 1.51.13 Chromium: 111.0.5563.50 and started Brave using the following
  • brave.exe --enable-logging=stderr --variations-server-url=https://variations.bravesoftware.com/seed
• ensured that BraveGoogleSignInPermissionStudy isn't visible under brave://version and clicking on the Google login via https://www.expensify.com opened another window asking the user to sign-in'

Example	Example

• restarted Brave using brave.exe --enable-logging=stderr --variations-server-url=https://variations.bravesoftware.com/seed
• ensured that BraveGoogleSignInPermissionStudy:Enabled via brave://version
• ensured that visiting https://www.expensify.com produced a Google login via https://www.expensify.com opened another window asking the user to sign-in' permission modal
• ensured that there's a new category named Google Sign-In via brave://settings/content
• ensured that the cookies are being displayed brave://settings/content/googleSignIn
  • Checked Allow and Never and ensured the cookie was being added either Not Allowed or Allowed

Example	Example	Example	Example

Release - BraveGoogleSignInPermissionStudy not appearing under brave://version

Brave | 1.48.171 Chromium: 110.0.5481.177 (Official Build) (64-bit)
-- | --
Revision | f34f7ab2d4ca4ad498ef42aeba4f4eb2c1392d63-refs/branch-heads/5481@{#1239}
OS | Windows 11 Version 22H2 (Build 22621.1265)

• downloaded/installed 1.48.171 Chromium: 110.0.5481.177 and started Brave using the following
  • brave.exe --enable-logging=stderr --variations-server-url=https://variations.bravesoftware.com/seed
• ensured that BraveGoogleSignInPermissionStudy isn't visible under brave://version and clicking on the Google login via https://www.expensify.com opened another window asking the user to sign-in'
• restarted the browser and ensured that BraveGoogleSignInPermissionStudy wasn't visible under brave://version when all the various Griffin studies were pulled/applied