[NaCl SDK] Get nacl_mounts_tests building.

native_client_sdk/src/libraries/nacl_mounts_test/example.dsc

Index: native_client_sdk/src/libraries/nacl_mounts_test/example.dsc
diff --git a/native_client_sdk/src/libraries/nacl_mounts_test/example.dsc b/native_client_sdk/src/libraries/nacl_mounts_test/example.dsc
new file mode 100644
index 0000000000000000000000000000000000000000..7db3e8d5e0120643cc8f6d01ac7ddb331ceafcfc
--- /dev/null
+++ b/native_client_sdk/src/libraries/nacl_mounts_test/example.dsc
@@ -0,0 +1,22 @@
+{
+  'TOOLS': ['newlib', 'glibc', 'pnacl', 'win'],
+  'TARGETS': [
+    {
+      'NAME' : 'nacl_mounts_test',
+      'TYPE' : 'main',
+      'SOURCES' : [
+        'kernel_intercept_test.cc',
+        'kernel_object_test.cc',
+        'kernel_proxy_test.cc',
+        'mount_node_test.cc',
+        'mount_test.cc',
+        'path_test.cc',
+        'test.cc',
+      ],
+      'LIBS': ['ppapi', 'pthread', 'gtest', 'nacl_mounts']
+    }
+  ],
+  'DEST': 'testing',
+  'NAME': 'nacl_mounts_test',
+  'EXPERIMENTAL': True,
+}