Add a NaCl-Private interface for opening files in DIR_PNACL_COMPONENT.

ppapi/c/private/ppb_nacl_private.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 PPAPI_C_PRIVATE_PPB_NACL_UTIL_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_NACL_UTIL_PRIVATE_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 
-#define PPB_NACL_PRIVATE_INTERFACE "PPB_NaCl(Private);0.5"
+#define PPB_NACL_PRIVATE_INTERFACE "PPB_NaCl(Private);0.6"
 
 struct PPB_NaCl_Private {
   // This function launches NaCl's sel_ldr process.  On success, the function
   // returns true, otherwise it returns false.  When it returns true, it will
   // write |socket_count| nacl::Handles to imc_handles.  Unless
   // EnableBackgroundSelLdrLaunch is called, this method must be invoked from
   // the main thread.
   PP_Bool (*LaunchSelLdr)(PP_Instance instance,
                           const char* alleged_url,
                           int socket_count,
@@ skipping 23 matching lines @@
   // http://code.google.com/p/chromium/issues/detail?id=114439#c8).
   // We use void* rather than the Windows HANDLE type to avoid an
   // #ifdef here.  We use int rather than PP_Bool/bool so that this is
   // usable with NaClSetBrokerDuplicateHandleFunc() without further
   // wrapping.
   int (*BrokerDuplicateHandle)(void* source_handle,
                                uint32_t process_id,
                                void** target_handle,
                                uint32_t desired_access,
                                uint32_t options);
+
+  // Returns a read-only file descriptor of a file rooted in the Pnacl
+  // component directory, or -1 on error.
+  // Do we want this to take a completion callback and be async, or
+  // or could we make this happen on another thread?
+  int (*GetReadonlyPnaclFd)(const char* filename);
 };
 
 #endif  // PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_