[NaCl SDK] nacl_io: Added support for access() syscall.

native_client_sdk/src/libraries/nacl_io/mount_http.h

Index: native_client_sdk/src/libraries/nacl_io/mount_http.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_http.h b/native_client_sdk/src/libraries/nacl_io/mount_http.h
index e10f1afcfe99600a4579463c61959f5c23bd4cb6..94de677be41a5f70663206e2138bc3d829407b83 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_http.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount_http.h
@@ -21,6 +21,7 @@ class MountHttp : public Mount {
  public:
   typedef std::map<std::string, MountNode*> NodeMap_t;
 
+  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int mode, MountNode** out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int permissions);
@@ -41,6 +42,10 @@ class MountHttp : public Mount {
   Error ParseManifest(char *text);
 
  private:
+  // Gets the URL to fetch for |path|.
+  // |path| is relative to the mount point for the HTTP filesystem.
+  std::string MakeUrl(const Path& path);
+
   std::string url_root_;
   StringMap_t headers_;
   NodeMap_t node_cache_;