Add iOS new menu study for Nightly/Beta

[kylehickinson]

Related issue: brave/brave-browser#42836

Only actually in nightly at the moment but would like to have it available in beta once channel migration occurs

[github-actions]

✅ Test Seed Generated Successfully

To apply the test seed:

1. Desktop: Launch the browser with --variations-pr=1291.
   Android: Set the command line to --variations-pr=1291 in debug menu, restart the browser.
   iOS: Set Variations PR to 1291 in Brave Core Switches debug menu, restart the browser.
2. Wait 5-10 seconds to fetch the seed.
3. Restart the browser to apply the seed.
4. Ensure Active Variations section at brave://version starts with the expected seed version (see below).

Seed Details

Parameter	Value
Version	pull/1291@732d8e499e6f32457b620a8b2851151897530ed9
Uploaded	Tue, 07 Jan 2025 17:45:18 GMT
PR commit	3d087f1
Base commit	a57acce
Merge commit	732d8e4
Serial number	f3d6469dd1a7752a56c7eb7bad1779a7

[kjozwiak]

Related issue: brave/brave-browser#42836

Only actually in nightly at the moment but would like to have it available in beta once channel migration occurs

@kylehickinson once we run through channel migrations, I'll run through the above and will get the above study pushed into production 👍

[kjozwiak]

Quick Note: The following basically runs through the Griffin study to ensure that it's being applied/working as expected. The actual feature/new menu was tested/verified by QA via brave/brave-browser#42836.

Nightly - NewiOSMenuUIStudy:Enabled (Mobile/Phone)

Verification PASSED on iPhone 11 running iOS 18.1.1 using the following build(s):

Brave | 1.76.5 Chromium: 132.0.6834.83 (Official Build) nightly (64-bit)
---- | ----
Revision | 68c952ae1cbc...
OS | iOS

• launched 1.76.5 Chromium: 132.0.6834.83 and ensured that the old menu is being used
• set Variations PR to 1291 via BraveCore Switches under the QA Developer Options
• once Variations PR has been set, restarted 1.76.5 Chromium: 132.0.6834.83
• restarted 1.76.5 Chromium: 132.0.6834.83 once more
• ensured that pull/1291@732d8e499e6f32457b620a8b2851151897530ed9 via brave://version under Active variations
• ensured that NewiOSMenuUIStudy:Enabled via brave://version
• ensured that the new Hamburger Menu is being used/visible

Example	Example	Example	Example

---

BETA - NewiOSMenuUIStudy:Enabled (Tablet)

Verification PASSED on iPad Air (3rd Gen) running iOS 18.1.1 using the following build(s):

Brave | 1.76.5 Chromium: 132.0.6834.83 (Official Build) nightly (64-bit)
---- | ----
Revision | 68c952ae1cbc...
OS | iOS

• launched 1.76.5 Chromium: 132.0.6834.83 and ensured that the old menu is being used
• set Variations PR to 1291 via BraveCore Switches under the QA Developer Options
• once Variations PR has been set, restarted 1.76.5 Chromium: 132.0.6834.83
• restarted 1.76.5 Chromium: 132.0.6834.83 once more
• ensured that pull/1291@732d8e499e6f32457b620a8b2851151897530ed9 via brave://version under Active variations
• ensured that NewiOSMenuUIStudy:Enabled via brave://version
• ensured that the new Hamburger Menu is being used/visible

Example	Example	Example	Example

---

Release - NewiOSMenuUIStudy (should be used/appear)

Verification PASSED on iPhone 11 running iOS 18.1.1 using the following build(s):

Brave | 1.73.97 Chromium: 131.0.6778.108 (Official Build) stable (64-bit)
--- | ---
Revision | 7e1cc6e3239d...
OS | iOS

• launched 1.73.97 Chromium: 131.0.6778.108 and ensured that the old menu is being used
• set Variations PR to 1291 via BraveCore Switches under the QA Developer Options
• once Variations PR has been set, restarted 1.73.97 Chromium: 131.0.6778.108
• restarted 1.73.97 Chromium: 131.0.6778.108 once more
• ensured that pull/1291@732d8e499e6f32457b620a8b2851151897530ed9 via brave://version under Active variations
• ensured that NewiOSMenuUIStudy is not being applied via brave://version
• ensured that the older menu is still being used

Example	Example	Example

[kjozwiak]

Uplift into main/production approved after deliberating with @brave/uplift-approvers. QA has verified the above Griffin study on Nightly & BETA via #1291 (comment). QA has also verified the feature via 1.75.x as per brave/brave-browser#42836 (comment) & brave/brave-browser#42836 (comment).