Make trace macros slightly more robust

Change-Id: I9544eb7b27fc1a971cabadd8d5b4b4b80678febf
diff --git a/include/utils/Trace.h b/include/utils/Trace.h
index 49578c4..6ee343d 100644
--- a/include/utils/Trace.h
+++ b/include/utils/Trace.h
@@ -17,6 +17,8 @@
 #ifndef ANDROID_TRACE_H
 #define ANDROID_TRACE_H
 
+#ifdef HAVE_ANDROID_OS
+
 #include <fcntl.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -57,4 +59,11 @@
 
 }; // namespace android
 
+#else // HAVE_ANDROID_OS
+
+#define ATRACE_NAME(...)
+#define ATRACE_CALL()
+
+#endif // HAVE_ANDROID_OS
+
 #endif // ANDROID_TRACE_H