Plumbing though mode parameter to open, since fusefs can make use of it.

native_client_sdk/src/tests/nacl_io_test/mock_kernel_proxy.h

Index: native_client_sdk/src/tests/nacl_io_test/mock_kernel_proxy.h
diff --git a/native_client_sdk/src/tests/nacl_io_test/mock_kernel_proxy.h b/native_client_sdk/src/tests/nacl_io_test/mock_kernel_proxy.h
index 03059a9e4bdac418487c2ad5be1f545b7cff004f..04a37affede35dfebaf6f928d87a3b6ab8d3f1fe 100644
--- a/native_client_sdk/src/tests/nacl_io_test/mock_kernel_proxy.h
+++ b/native_client_sdk/src/tests/nacl_io_test/mock_kernel_proxy.h
@@ -48,7 +48,7 @@ class MockKernelProxy : public nacl_io::KernelProxy {
   MOCK_METHOD5(mount, int(const char*, const char*, const char*, unsigned long,
                           const void*));
   MOCK_METHOD2(munmap, int(void*, size_t));
-  MOCK_METHOD2(open, int(const char*, int));
+  MOCK_METHOD3(open, int(const char*, int, mode_t));
   MOCK_METHOD1(pipe, int(int[2]));
   MOCK_METHOD3(read, ssize_t(int, void*, size_t));
   MOCK_METHOD3(readlink, int(const char*, char*, size_t count));