Enable coverage for VR VTS.

Bug: 32022964
Test: manual
Change-Id: I597a9692886686934b374fac9e6bd1c51e683a92
diff --git a/vr/1.0/vts/functional/Android.bp b/vr/1.0/vts/functional/Android.bp
index 2929fe7..551f27c 100644
--- a/vr/1.0/vts/functional/Android.bp
+++ b/vr/1.0/vts/functional/Android.bp
@@ -26,7 +26,11 @@
     ],
     static_libs: ["libgtest"],
     cflags: [
-        "-O0",
+       "--coverage",
+       "-O0",
         "-g",
     ],
+    ldflags: [
+        "--coverage"
+    ]
 }