[NaCl SDK] Add nacl_mounts to NaCl SDK build. Experimental for now.

native_client_sdk/src/libraries/utils/macros.h

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef LIBRARIES_UTILS_MACROS_H_
 #define LIBRARIES_UTILS_MACROS_H_
 
 /**
-* A macro to disallow the evil copy constructor and operator= functions
-* This should be used in the private: declarations for a class.
-*/
+ * A macro to disallow the evil copy constructor and operator= functions
+ * This should be used in the private: declarations for a class.
+ */
 #define DISALLOW_COPY_AND_ASSIGN(TypeName)      \
   TypeName(const TypeName&);                    \
   void operator=(const TypeName&)
 
+/** returns the size of a member of a struct. */
+#define MEMBER_SIZE(struct_name, member) sizeof(((struct_name*)0)->member)
 
 /**
-* Macros to prevent name mangling of defnitions, allowing them to be
-* referenced from C.
-*/
+ * Macros to prevent name mangling of defnitions, allowing them to be
+ * referenced from C.
+ */
 #ifdef __cplusplus
 # define EXTERN_C_BEGIN  extern "C" {
 # define EXTERN_C_END    }
 #else
 # define EXTERN_C_BEGIN
 # define EXEERN_C_END
 #endif  /* __cplusplus */
 
 
 #endif  /* LIBRARIES_UTILS_MACROS_H_ */