Set file tokens for NaCl main nexe if available to enable validation caching.

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.
  */
 
-/* From private/ppb_nacl_private.idl modified Mon May 19 11:12:19 2014. */
+/* From private/ppb_nacl_private.idl modified Wed May 21 13:23:26 2014. */
 
 #ifndef PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/pp_var.h"
@@ skipping 392 matching lines @@
   /* PP_Var string of attributes describing the CPU features supported
    * by the current architecture. The string is a comma-delimited list
    * of attributes supported by LLVM in its -mattr= option:
    *   http://llvm.org/docs/CommandGuide/llc.html#cmdoption-mattr */
   struct PP_Var (*GetCpuFeatureAttrs)(void);
   /* Posts a message to the JavaScript object for the given instance.
    * This method may be called on any thread.
    */
   void (*PostMessageToJavaScript)(PP_Instance instance, const char* message);
   /* Downloads the .nexe file at the given URL to a file, and sets |handle|
-   * to a handle to a file containing its contents. */
+   * to a handle to a file containing its contents.
+   * If metadata for identity-based validation caching is available
+   * then it sets file_token_lo and file_token_lo (otherwise left untouched).
+   */
   void (*DownloadNexe)(PP_Instance instance,
                        const char* url,
                        PP_FileHandle* handle,
+                       uint64_t* file_token_lo,
+                       uint64_t* file_token_hi,
                        struct PP_CompletionCallback callback);
 };
 
 typedef struct PPB_NaCl_Private_1_0 PPB_NaCl_Private;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_ */