Use the .dm file at runtime for verification.

Bug: 112284845
Test: 674-HelloWorld-Dm
Change-Id: Icd07f86cfb2b5428186a4c086f042890eaad249b
diff --git a/runtime/vdex_file.h b/runtime/vdex_file.h
index a66ff88..35be4fb 100644
--- a/runtime/vdex_file.h
+++ b/runtime/vdex_file.h
@@ -246,6 +246,9 @@
                          error_msg);
   }
 
+  static std::unique_ptr<VdexFile> OpenFromDm(const std::string& filename,
+                                              const ZipArchive& archive);
+
   const uint8_t* Begin() const { return mmap_.Begin(); }
   const uint8_t* End() const { return mmap_.End(); }
   size_t Size() const { return mmap_.Size(); }