[NaCl SDK] Upate atomic ops in nacl_io

native_client_sdk/src/libraries/nacl_io/mount_html5fs.h

Index: native_client_sdk/src/libraries/nacl_io/mount_html5fs.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_html5fs.h b/native_client_sdk/src/libraries/nacl_io/mount_html5fs.h
index d2e1b083ee44bda1408f215bcbaeb400efe538b3..9d885b4bfbcffc6031538288980fa78ee7882844 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_html5fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount_html5fs.h
@@ -10,6 +10,7 @@
 #include "nacl_io/mount.h"
 #include "nacl_io/pepper_interface.h"
 #include "nacl_io/typed_mount_factory.h"
+#include "sdk_util/simple_lock.h"
 
 class MountNode;
 
@@ -40,6 +41,7 @@ class MountHtml5Fs : public Mount {
   bool filesystem_open_has_result_;  // protected by lock_.
   Error filesystem_open_error_;      // protected by lock_.
   pthread_cond_t filesystem_open_cond_;
+  SimpleLock lock_;
 
   friend class TypedMountFactory<MountHtml5Fs>;
 };