[NaCl SDK] Add filesystem passing example.

native_client_sdk/src/build_tools/generate_make.py

Index: native_client_sdk/src/build_tools/generate_make.py
diff --git a/native_client_sdk/src/build_tools/generate_make.py b/native_client_sdk/src/build_tools/generate_make.py
index 38d1ae325830e00f0c76424392a0d03eda546422..61aaaebf64436ca140ab67bd74d1b98b0d38f57e 100644
--- a/native_client_sdk/src/build_tools/generate_make.py
+++ b/native_client_sdk/src/build_tools/generate_make.py
@@ -147,10 +147,13 @@ def GenerateManifest(srcroot, dstroot, desc):
   srcpath = os.path.join(SDK_RESOURCE_DIR, 'manifest.json.template')
   dstpath = os.path.join(outdir, 'manifest.json')
   permissions = desc.get('PERMISSIONS', [])
-  socket_permissions = desc.get('SOCKET_PERMISSIONS', [])
   combined_permissions = list(permissions)
+  socket_permissions = desc.get('SOCKET_PERMISSIONS', [])
   if socket_permissions:
     combined_permissions.append({'socket': socket_permissions})
+  filesystem_permissions = desc.get('FILESYSTEM_PERMISSIONS', [])
+  if filesystem_permissions:
+    combined_permissions.append({'fileSystem': filesystem_permissions})
   pretty_permissions = json.dumps(combined_permissions,
                                   sort_keys=True, indent=4)
   replace = {