Add android.test.base/stubs dependency

In preparation for the removal of the non-junit classes in the
android.test.base library from the android.jar this adds a dependency
on android.test.base/stubs to ensure this code will continue to
compile.

The following change descriptions were generated automatically and so
may be a little repetitive. They are provided to give the reviewer
enough information to check the comments match what has actually been
changed and check the reasoning behind the changes.

* samples/ApiDemos/tests/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    ApiDemosTests's will need them in order to compile once its classes
    are removed from the current SDK on which it currently depends.

* samples/BrokenKeyDerivation/tests/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    BrokenKeyDerivationTests's will need them in order to compile once
    its classes are removed from the current SDK on which it currently
    depends.

* samples/HelloActivity/tests/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    HelloActivityTests's will need them in order to compile once its
    classes are removed from the current SDK on which it currently
    depends.

* samples/LunarLander/tests/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    LunarLanderTests's will need them in order to compile once its
    classes are removed from the current SDK on which it currently
    depends.

* samples/SkeletonApp/tests/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    SkeletonAppTests's will need them in order to compile once its
    classes are removed from the current SDK on which it currently
    depends.

* samples/Snake/tests/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    SnakeTests's will need them in order to compile once its classes
    are removed from the current SDK on which it currently depends.

* samples/Vault/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    Vault's will need them in order to compile once its classes are
    removed from the current SDK on which it currently depends.

Bug: 30188076
Test: make dist
Change-Id: Id7fb558504706668a85bf840529f6cd075499d6a
7 files changed