Information about where resources are defined can make having
reproducible builds more difficult, makes the generates resources.pb
large, and can exposes details about the machines that compiled the
resources.
The --exclude-sources flags can only be used when building a proto APK
and prevents source information from being included in the generated
resources protobuf.
Bug: 134929532
Test: checked debug string with and without the string
Change-Id: Ia345f067fe781ea82a4bcad37eb55576c72c44d7
ef9e688393