Add an attribute android:classLoader which can be set to the name
of the classloader the base or split wishes to use. For now, this can
only be set to "dalvik.system.PathClassLoader" or
"dalvik.system.DelegateLastClassLoader". The current implementation
only allows the classloader to exist in the boot classpath but that
restriction can be loosened in a future change if necessary.
Test: cts-tradefed run cts-dev -m CtsAppSecurityHostTestCases
Bug: 36044779
Change-Id: I5a51f7aa0c8c4c398d2f46129eb06785cc8e3c3f
f9419f0f85