Added gtest to the list. cd to /sdcard before running native tests. Some test need to be run in a place where they can write on the disk. I know we should stop using /sdcard but until I see the new document explaining how the launcher can access the playground, we are going to keep it that way. 
diff --git a/testrunner/test_defs.xml b/testrunner/test_defs.xml index 2307cfa..68eab5d 100644 --- a/testrunner/test_defs.xml +++ b/testrunner/test_defs.xml 
@@ -561,12 +561,12 @@  description="Android STL."  extra_build_args="ASTL_TESTS=1" />   -<!-- pending patch 820 +<!-- Google Test -->  <test-native name="gtest"  build_path="external/gtest"  description="Google test."  extra_build_args="GTEST_TESTS=1" /> ---> +    <!-- host java tests -->  <test-host name="cts-appsecurity"