ART: Change ART for new native bridge sequence

Initialize or unload after a fork.

Change-Id: I5a20de1cb68dd1802937b369b14c50c9c1031c67
diff --git a/runtime/runtime.h b/runtime/runtime.h
index 79d4554..e255272 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -387,9 +387,13 @@
 
   void SetStatsEnabled(bool new_state);
 
+  enum class NativeBridgeAction {  // private
+    kUnload,
+    kInitialize
+  };
   void PreZygoteFork();
   bool InitZygote();
-  void DidForkFromZygote();
+  void DidForkFromZygote(NativeBridgeAction action);
 
   const instrumentation::Instrumentation* GetInstrumentation() const {
     return &instrumentation_;