Add test for bitset/mask type.

Test: hidl_test
Change-Id: I8bcd304184ff6b7794a9d0b5d3999f071604471d
diff --git a/tests/bar/1.0/default/Bar.cpp b/tests/bar/1.0/default/Bar.cpp
index cac0845..a9b6c25 100644
--- a/tests/bar/1.0/default/Bar.cpp
+++ b/tests/bar/1.0/default/Bar.cpp
@@ -185,6 +185,12 @@
     return Void();
 }
 
+Return<void> Bar::takeAMask(BitField bf, uint8_t first, const MyMask& second, uint8_t third,
+            takeAMask_cb _hidl_cb) {
+    _hidl_cb(bf, bf | first, second.value & bf, (bf | bf) & third);
+    return Void();
+}
+
 IBar* HIDL_FETCH_IBar(const char* /* name */) {
     return new Bar();
 }