Added unit test of vp8_set_roimap()

Change-Id: I99937cbdd6bfe52b7c8ae42f05526dfc06a602f4
diff --git a/test/test.mk b/test/test.mk
index 15bd793..f7db46f 100644
--- a/test/test.mk
+++ b/test/test.mk
@@ -33,6 +33,7 @@
 LIBVPX_TEST_SRCS-yes                   += idctllm_test.cc
 LIBVPX_TEST_SRCS-yes                   += intrapred_test.cc
 LIBVPX_TEST_SRCS-$(CONFIG_POSTPROC)    += pp_filter_test.cc
+LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += set_roi.cc
 LIBVPX_TEST_SRCS-yes                   += sixtap_predict_test.cc
 
 endif