Vpn always on & kill switch android

[deeppandya]

Resolves brave/brave-browser#37013
Resolves brave/brave-browser#23193

Submitter Checklist:

• I confirm that no security/privacy review is needed and no other type of reviews are needed, or that I have requested them
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally:
  • npm run test -- brave_browser_tests, npm run test -- brave_unit_tests wiki
  • npm run presubmit wiki, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

[SergeyZhukovsky]

I would do 1, 2, 3, 4 rather or together or 3 and 4 as separate strings as 1, 2.

[tapanmodh]

nit: empty line

[SergeyZhukovsky]

++

[github-actions]

[puLL-Merge] - brave/brave-core@23293

Description

This PR adds a new "Always-on VPN & Kill switch" feature to the Brave VPN settings on Android. It includes a tutorial screen explaining how to enable always-on VPN and the kill switch in the Android system settings.

Changes

Changes

• android/brave_java_resources.gni: Adds new drawables for the always-on VPN tutorial
• android/brave_java_sources.gni: Adds new Java classes for the always-on VPN feature
• android/java/AndroidManifest.xml: Declares the new VpnAlwaysOnActivity
• android/java/org/chromium/chrome/browser/vpn/activities/: Adds VpnAlwaysOnActivity to handle the always-on tutorial
• android/java/org/chromium/chrome/browser/vpn/adapters/: Adds AlwaysOnPagerAdapter for the tutorial view pager
• android/java/res/: Adds new drawables, layouts, colors, dimensions and styles for the always-on tutorial UI
• android/java/res/xml/brave_vpn_preferences.xml: Adds the "Always-on VPN" preference to Brave VPN settings
• browser/ui/android/strings/android_brave_strings.grd: Adds new strings for the always-on tutorial

Security Hotspots

None identified. The changes are limited to the Brave VPN UI and do not seem to introduce any new security risks. The always-on VPN and kill switch capabilities leverage the existing Android system settings securely.

[mkarolin]

strings++