Add mount sources for a MountNode (inode)

native_client_sdk/src/libraries/nacl_mounts/mount_node_dir.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_NACL_MOUNTS_MOUNT_NODE_DIR_H_
 #define LIBRARIES_NACL_MOUNTS_MOUNT_NODE_DIR_H_
 
 #include <dirent.h>
 
@@ skipping 14 matching lines @@
   typedef std::map<std::string, MountNode*> MountNodeMap_t;
 
   virtual int GetDents(size_t offs, struct dirent* pdir, size_t count);
   virtual int Read(size_t offs, void *buf, size_t count);
   virtual int Truncate(size_t size);
   virtual int Write(size_t offs, void *buf, size_t count);
 
   // Adds a finds or adds a directory entry as an INO, updating the refcount
   virtual int AddChild(const std::string& name, MountNode *node);
   virtual int RemoveChild(const std::string& name);
-  virtual MountNode*  FindChild(const std::string& name);
+  virtual MountNode* FindChild(const std::string& name);
+  virtual int ChildCount();
 
 
 protected:
    void ClearCache();
    void BuildCache();
 
 private:
   struct dirent* cache_;
   MountNodeMap_t map_;
-  friend class Mount;
+
+  friend class MountMem;
 };
 
 #endif  // LIBRARIES_NACL_MOUNTS_MOUNT_NODE_DIR_H_