--permission-lifetime-test-seconds=20 doesn't appear to work on Android nightly builds

[stephendonner]

Description

--permission-lifetime-test-seconds=20 doesn't appear to work on Android nightly builds

Steps to Reproduce

1. launch nightly on Android
2. enable Permission Lifetimes via brave://flags
3. open Settings > Developer Options > QA Preferences
4. enter the code (ping me on Slack if you don't have it)
5. input --permission-lifetime-test-seconds=20 into the Enter Command Line string textfield
6. tap OK
7. tap on RELAUNCH NOW
8. open https://permission.site
9. tap on Camera + Microphone
10. look at the radio-button options under Give permission

Actual result:

There's no 20 seconds option to choose from amongst the radio buttons for Give permission

example	example	example

Expected result:

There should be a 20 seconds option below forever, as there is on desktop

Reproduces how often:

100%

Brave version (brave://version info)

Brave - Nightly 1.25.42, Chromium 90.0.4430.85 on Android 9

@goodov @deeppandya am I doing this right? Thanks in advance for looking! 👍

[goodov]

This cmdline stub mechanism ignores the first parameter. This is not specific to permission-lifetime-test-seconds, any parameter will be ignored. To test things you can use this: _ --permission-lifetime-test-seconds=10 as per: the first command line item should be a "_" (underscore) followed by the ones you actually need.

[goodov]

Created to fix this behavior. #15540