Add oatopt drop in replacement for dexopt

Change-Id: I094375230af2d9a88e30245b390cac71be7b50f4
diff --git a/src/zip_archive.h b/src/zip_archive.h
index 0c9e6c2..13a22cc 100644
--- a/src/zip_archive.h
+++ b/src/zip_archive.h
@@ -102,7 +102,10 @@
   static const int32_t kCDECommentLen   = 32;  // offset to comment length
   static const int32_t kCDELocalOffset  = 42;  // offset to local hdr
 
+  // return new ZipArchive instance on success, NULL on error.
   static ZipArchive* Open(const std::string& filename);
+  static ZipArchive* Open(int fd);
+
   ZipEntry* Find(const char * name);
 
   ~ZipArchive() {