Enable unit test framework in experimental branch.

Change-Id: I27c98025b2857e2911005a52dd57c46e2524e815
diff --git a/test/test.mk b/test/test.mk
new file mode 100644
index 0000000..bfef823
--- /dev/null
+++ b/test/test.mk
@@ -0,0 +1,3 @@
+LIBVPX_TEST_SRCS-yes += test.mk
+LIBVPX_TEST_SRCS-yes += boolcoder_test.cc
+LIBVPX_TEST_SRCS-yes += test_libvpx.cc