Now that .srcjars are extracted within out/Default/gen during build, we should no longer need to explicitly extract srcjars during generate_gradle.py. Instead, we should point studio to these extracted files, which will include annotation processor-generated ones.

Mind pointing me to the logic that extracts srcjars? That would be great since then generate_gradle.py would have to build less of the world.

srcjars are extracted here:
https://cs.chromium.org/chromium/src/build/android/gyp/javac.py?rcl=cf0755e164aefc79cebfe2d37ce46e8d06f0f2d9&l=295

And annotation processors a bit further down:
https://cs.chromium.org/chromium/src/build/android/gyp/javac.py?rcl=cf0755e164aefc79cebfe2d37ce46e8d06f0f2d9&l=378

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