Enable meta-based validation for shared libraries.

src/trusted/validator/validation_cache.h

Index: src/trusted/validator/validation_cache.h
diff --git a/src/trusted/validator/validation_cache.h b/src/trusted/validator/validation_cache.h
index 6e2976be97c7857e0ee5d0a7ce7d57b50d2f67ab..8232ba4c3dafcb4465a35b4413603ca5b44f5799 100644
--- a/src/trusted/validator/validation_cache.h
+++ b/src/trusted/validator/validation_cache.h
@@ -57,6 +57,8 @@ struct NaClValidationCache {
   void (*SetKnownToValidate)(void *query);
   void (*DestroyQuery)(void *query);
   int (*CachingIsInexpensive)(const struct NaClValidationMetadata *metadata);
+  int (*ResolveFileNonce)(void *handle, uint64_t nonce, int32_t *fd,
+                          char **file_path, uint32_t *file_path_length);
 };
 
 extern int CachingIsInexpensive(struct NaClValidationCache *cache,