Add Aura experiment

[joshliebe]

Task/Issue URL: https://app.asana.com/0/488551667048375/1208893765398547/f

Description

Sets the ATB variant and origin for Aura installs in order to measure retention.

Steps to test this PR

Point at the JSON Blob linked in the task

Feature enabled and new user Aura install

• Check out this branch
• Change installationSourceModern() in RealInstallSourceExtractor to return an Aura package (e.g. com.sec.android.app.samsungapps)
• On a fresh emulator, freshly install the app
• Filter logcat by Initialized ATB
• Verify that the variant is mq
• Filter logcat by m_android_install
• Verify that origin=funnel_app_aurapaid_android
• Verify that reinstall=false

Feature enabled and returning user Aura install

• On the same emulator, uninstall and freshly install the app
• Filter logcat by Initialized ATB
• Verify that the variant is mq
• Filter logcat by m_android_install
• Verify that origin=funnel_app_aurapaid_android
• Verify that reinstall=true

Feature disabled and new user Aura install

• Disable auraExperiment in the config
• On a fresh emulator, freshly install the app
• Filter logcat by Initialized ATB
• Verify that the variant is set normally (Not mq)
• Filter logcat by m_android_install
• Verify that origin=funnel_app_aurapaid_android is not sent
• Verify that reinstall=false

Feature disabled and returning user Aura install

• On the same emulator, uninstall and freshly install the app
• Filter logcat by Initialized ATB
• Verify that the variant is set normally (Not mq)
• Filter logcat by m_android_install
• Verify that origin=funnel_app_aurapaid_android is not sent
• Verify that reinstall=true

Feature enabled and new user install (Not Aura)

• Re-enable auraExperiment in the config
• Change installationSourceModern() in RealInstallSourceExtractor to return something else (e.g. com.example)
• On a fresh emulator, freshly install the app
• Filter logcat by Initialized ATB
• Verify that the variant is set normally (Not mq)
• Filter logcat by m_android_install
• Verify that origin=funnel_app_aurapaid_android is not sent
• Verify that reinstall=false

Feature enabled and returning user install (Not Aura)

• On the same emulator, uninstall and freshly install the app
• Filter logcat by Initialized ATB
• Verify that the variant is set normally (Not mq)
• Filter logcat by m_android_install
• Verify that origin=funnel_app_aurapaid_android is not sent
• Verify that reinstall=true

[joshliebe]

• Add Aura experiment #5343 👈 (View in Graphite)
• develop

This stack of pull requests is managed by Graphite. Learn more about stacking.

[CDRussell]

Tested and working well! a few nit/suggestions, but overall LGTM

[aitorvs]

I believe we don't need to add code outside the install-impl package. Unless I miss something, everything can just be an implementation detail. No need to add the install-api neither add anything in the :app module

we'll discuss but no need to block review

[CDRussell]

New approach tested and again, and still working as expected.