Can't run sample in emulator via AS: not bundling x86 deps? (improve docs?)

[mcomella]

I built the default AS configuration, which uses the samples-browsermodule, but am unable to run due to: INSTALL_FAILED_NO_MATCHING_ABIS. I assume it's because the sample is bundling the Gecko AARs which don't have an x86 variant.

┆Issue is synchronized with this Jira Task

[mcomella]

I discovered where the gecko x86 dependencies can be included, included them, and fixed the issue:

https://github.com/mozilla-mobile/android-components/blob/master/samples/browser/build.gradle#L47-L48

Maybe we should include some docs (in the readme?) about how to run the sample.

[pocmo]

No we have multiple build variants for the app:

• geckoview channel (nightly, beta, production) X processor architecture (arm, aarch64, x86).