Allow proguarding the main app and the test app in a single run.

Bug: 12895101
Change-Id: I6804d73306a164d3e3ec0cab4743f9582b5ef2cf
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index a8b7b28..9713b6e 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -141,6 +141,7 @@
 LOCAL_POST_INSTALL_CMD:=
 LOCAL_DIST_BUNDLED_BINARIES:=
 LOCAL_HAL_STATIC_LIBRARIES:=
+LOCAL_TEST_MODULE_TO_PROGUARD_WITH:=
 
 # Trim MAKEFILE_LIST so that $(call my-dir) doesn't need to
 # iterate over thousands of entries every time.