Prepare for removal of junit and android.test classes from Android API (step 1)

In preparation for removing junit and android.test classes from
the Android API this change adds explicit dependencies on junit
and/or legacy-android-test to ensure that modules will compile
properly once it is removed.

Care was taken to ensure that any targets that depended,
directly or indirectly, on android-support-test did not also
depend on junit or hamcrest as they conflict with the versions
embedded within android-support-test.

Bug: 30188076
Test: make checkbuild
Change-Id: I7688bbb696bc2a2a49759b53841438743b7d298c
Merged-In: Iad08db948fb9d6889767b908406ccab0f279d648
diff --git a/tests/Android.mk b/tests/Android.mk
index db6bf60..5eeec62 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -18,7 +18,7 @@
 LOCAL_MODULE_TAGS := tests
 
 LOCAL_JAVA_LIBRARIES := android.test.runner
-LOCAL_STATIC_JAVA_LIBRARIES := legacy-android-test
+LOCAL_STATIC_JAVA_LIBRARIES := legacy-android-test junit
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)