Flags common for native tests

With the CL, "include $(BUILD_NATIVE_TEST)" to build native test;
"include $(BUILD_HOST_NATIVE_TEST)" to build a host native test.

Change-Id: Icdbbcf906cd4c5c35e65962897490052cd051102
diff --git a/core/native_test.mk b/core/native_test.mk
new file mode 100644
index 0000000..7fe1637
--- /dev/null
+++ b/core/native_test.mk
@@ -0,0 +1,18 @@
+###########################################
+## A thin wrapper around BUILD_EXECUTABLE
+## Common flags for native tests are added.
+###########################################
+
+LOCAL_CFLAGS += -DGTEST_OS_LINUX -DGTEST_HAS_STD_STRING
+LOCAL_C_INCLUDES += bionic \
+                    bionic/libstdc++/include \
+                    external/gtest/include \
+                    external/stlport/stlport
+LOCAL_STATIC_LIBRARIES +=
+LOCAL_SHARED_LIBRARIES += libstlport
+
+ifndef LOCAL_MODULE_PATH
+LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_NATIVE_TESTS)
+endif
+
+include $(BUILD_EXECUTABLE)