NaCl: enable meta-based validation for shared libraries.

chrome/nacl/nacl_validation_db.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 CHROME_NACL_NACL_VALIDATION_DB_H_
 #define CHROME_NACL_NACL_VALIDATION_DB_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 
 class NaClValidationDB {
  public:
   NaClValidationDB() {}
   virtual ~NaClValidationDB() {}
 
   virtual bool QueryKnownToValidate(const std::string& signature) = 0;
   virtual void SetKnownToValidate(const std::string& signature) = 0;
+  virtual bool ResolveFileNonce(uint64 nonce, int32* fd,
+                                std::string* path) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NaClValidationDB);
 };
 
 #endif  // CHROME_NACL_NACL_VALIDATION_DB_H_