Build libprofile_rt to enable code coverage

Change-Id: I99239cf5e43c78fc06d6ad9f3b6718531baa2983
diff --git a/Android.mk b/Android.mk
index e1d5713..8e432d3 100644
--- a/Android.mk
+++ b/Android.mk
@@ -323,6 +323,17 @@
 include $(BUILD_STATIC_LIBRARY)
 
 #=====================================================================
+# Device Static Library: libprofile_rt
+#=====================================================================
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE = libprofile_rt
+LOCAL_SRC_FILES = lib/profile/GCDAProfiling.c
+
+include $(BUILD_STATIC_LIBRARY)
+
+#=====================================================================
 # Device Shared Library: libcompiler_rt
 #=====================================================================