Adding untrusted crash dump / stack trace tests.

src/untrusted/crash_dump/nacl.scons

Index: src/untrusted/crash_dump/nacl.scons
diff --git a/src/untrusted/crash_dump/nacl.scons b/src/untrusted/crash_dump/nacl.scons
new file mode 100644
index 0000000000000000000000000000000000000000..0a99faea037221185c3f5e44a32229f23f8f72d7
--- /dev/null
+++ b/src/untrusted/crash_dump/nacl.scons
@@ -0,0 +1,12 @@
+# -*- python -*-
+# Copyright (c) 2012 The Native Client Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+Import('env')
+
+# TODO(bradnelson): Support x86-64 when the frame pointer is available there.
+if not env.Bit('build_x86_32'):
+  Return()
+
+env.ComponentLibrary('untrusted_crash_dump', 'untrusted_crash_dump.c')