Add android.test.mock/stubs dependency

In preparation for the removal of the android.test.mock classes from
the android.jar this adds dependencies on android.test.mock/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.

* tests/Android.mk
    Added 'android.test.mock.stubs' to LOCAL_JAVA_LIBRARIES because
    ContactsTests'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: I3944e6f5049c2c369c5e18c396208dea8c255b83
diff --git a/tests/Android.mk b/tests/Android.mk
index a70af48..dfea843 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -23,7 +23,11 @@
     mockito-target-minus-junit4 \
     ub-uiautomator
 
-LOCAL_JAVA_LIBRARIES := android.test.runner.stubs android.test.base.stubs
+LOCAL_JAVA_LIBRARIES := \
+    android.test.runner.stubs \
+    android.test.base.stubs \
+    android.test.mock.stubs \
+
 
 LOCAL_AAPT_FLAGS := \
     --auto-add-overlay \