Fix dumpsys meminfo for art

BUG:10112253
Change-Id: I2a34cc0841bdcf922c4ab4eadda360313858a0d6
diff --git a/runtime/utils.h b/runtime/utils.h
index fcbb992..c506fba 100644
--- a/runtime/utils.h
+++ b/runtime/utils.h
@@ -356,6 +356,7 @@
 // Check whether the given filename has a valid extension
 bool IsValidZipFilename(const std::string& filename);
 bool IsValidDexFilename(const std::string& filename);
+bool IsValidImageFilename(const std::string& filename);
 bool IsValidOatFilename(const std::string& filename);
 
 class VoidFunctor {