Supporrt tapas build for vector tests

Such that UX team has less pain on building the VD / AVD assets.
This also requires removing internal API dependence in the test.

To build the VectorDrawableTest with prebuilt SDK.
<root dir>/tapas VectorDrawableTest
<root dir>/make -j64 showcommand
Then later for incremental build.
<root dir>/mmm ./frameworks/base/tests/VectorDrawableTest/ -j20

b/18260896

Change-Id: Id559074df78d7c2a5c529c545834da23986bc15f
diff --git a/tests/VectorDrawableTest/Android.mk b/tests/VectorDrawableTest/Android.mk
index dd8a4d4..3d44e33 100644
--- a/tests/VectorDrawableTest/Android.mk
+++ b/tests/VectorDrawableTest/Android.mk
@@ -23,4 +23,6 @@
 
 LOCAL_MODULE_TAGS := tests
 
+LOCAL_SDK_VERSION := current
+
 include $(BUILD_PACKAGE)