Add a gtest build target for the host.

Change-Id: Ib888e143c7f3c110a0596ce37f51138a4da31b5a
http://b/4584343
diff --git a/src/assembler_x86_test.cc b/src/assembler_x86_test.cc
new file mode 100644
index 0000000..3c2a02d
--- /dev/null
+++ b/src/assembler_x86_test.cc
@@ -0,0 +1,10 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+// Author: cshapiro@google.com (Carl Shapiro)
+#include "src/assembler_x86.h"
+
+#include <stdio.h>
+#include "gtest/gtest.h"
+
+TEST(AssemblerX86, Init) {
+  ASSERT_TRUE(true);
+}