The objects in this prebuilt directory can be built from
	platform/frameworks/base

Both are built using the aosp_arm64 variant.

platformprotos-prebuilt.jar:
Built from commit ef2cbcd7c39298c6d4cb8cf43d995932d82531b2.

platformtestprotos-prebuilt.jar:
Built from commit ef2cbcd7c39298c6d4cb8cf43d995932d82531b2.

Note: Before dropping the jars, please run the following command to strip the
jar manifest file, which causes hidden dependency on jars in the Class-Path.
(Similar for platformtestprotos)
$ zip -d platformprotos-prebuilt.jar META-INF/MANIFEST.MF