ART: GTest target tests missing "PASSED"

This seems to have gotten lost a while ago.

Change-Id: Ia0114d4fc0dfcf6e53339307cd556e168312fc53
diff --git a/Android.mk b/Android.mk
index d88766d..4351be9 100644
--- a/Android.mk
+++ b/Android.mk
@@ -243,6 +243,7 @@
 define declare-test-art-target-gtest
 .PHONY: test-art-target-gtest$(1)
 test-art-target-gtest$(1): $(ART_TARGET_GTEST_TARGETS$(1))
+	@echo test-art-target-gtest$(1) PASSED
 endef
 $(eval $(call call-art-multi-target-rule,declare-test-art-target-gtest,test-art-target-gtest))