Add unit test for exercising AbstractMethodErrorStub code.

Change-Id: I6021459a75681c92a40931f591852e974f1ca1a6
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 94b0fbc..ffa2636 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -178,6 +178,7 @@
 
 # subdirectories of test/
 TEST_DEX_DIRECTORIES := \
+	AbstractMethod \
 	AllFields \
 	CreateMethodDescriptor \
 	Fibonacci \