Add baseline profile generation

[Isira-Seneviratne]

Add module for generating a baseline profile for the app.

[IndusAryan]

wow, pr so advanced that i couldn't understand what the code is doing (ik making app fast somehow) and the pixel props included (for what?), maybe @RafaelsRamos can drop his 2 cents here with good explanation.

[Isira-Seneviratne]

wow, pr so advanced that i couldn't understand what the code is doing (ik making app fast somehow) and the pixel props included (for what?), maybe @RafaelsRamos can drop his 2 cents here with good explanation.

It allows a profile of methods called during startup to be generated, so that they can be compiled ahead of time to improve startup and overall performance on Android 7.0 and later: https://android-developers.googleblog.com/2022/01/improving-app-performance-with-baseline.html

[IndusAryan]

i understood now, but why pixel virtual device prop is needed for tests and why source compat and jvm target of baseline is not jdk 17 (LTS) but 1_8 ,different from Libretube

[RafaelsRamos]

The source compact can be 17, it defaulted to 1_8 because Android Studio generated it this way (it is probably a good idea to change it to 17 for consistency).

Regarding the virtual device, the way the baseline profile generates the profiles, is by pre-compiling classes and methods from flows we want him to optimize (startup on this PR). This must be done on rooted devices (rooted emulators or physical devices).

The reason why we want it on an emulator is because it should be ran before a new release, so adding it to the release pipeline would be the ultimate goal.

[RafaelsRamos]

Question - While generating the baseline-prof.txt I see that the content is not obfuscated. Did you use the nonMinifiedRelease build variant?

I see that Google suggests using a .pro file with -dontobfuscate, but it does not seem to work 🤔

[Isira-Seneviratne]

Question - While generating the baseline-prof.txt I see that the content is not obfuscated. Did you use the nonMinifiedRelease build variant?

Yeah, the profile generation does that: https://developer.android.com/topic/performance/baselineprofiles/create-baselineprofile

I see that Google suggests using a .pro file with -dontobfuscate, but it does not seem to work 🤔

There's already a -dontobfuscate rule in the project's ProGuard file.