Adding common  code for instrumentation and robolectric tests

Change-Id: Ia338f0565868bb174ef5f6721924944792866be6
diff --git a/tests/Android.mk b/tests/Android.mk
index a9fff8e..4d1bfa6 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -62,7 +62,11 @@
     LOCAL_STATIC_JAVA_LIBRARIES += ub-launcher-aosp-tapl
 endif
 
-LOCAL_SRC_FILES := $(call all-java-files-under, src)
+LOCAL_SRC_FILES := \
+	$(call all-java-files-under, src) \
+	$(call all-java-files-under, src_common)
+
+
 LOCAL_FULL_LIBS_MANIFEST_FILES := $(LOCAL_PATH)/AndroidManifest-common.xml
 
 LOCAL_PACKAGE_NAME := Launcher3Tests