Enable the embedder to specify what kind of context was disposed

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 60ad9812c065225181b2d96425e1a1d0e256cf3b..852df70219819240179ec44d1e3793185bfab01e 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -5179,8 +5179,11 @@ class V8_EXPORT Isolate {
    * these notifications to guide the GC heuristic. Returns the number
    * of context disposals - including this one - since the last time
    * V8 had a chance to clean up.
+   *
+   * The optional parameter |dependant_context| specifies whether the disposed
+   * context was depending on state from other contexts or not.
    */
-  int ContextDisposedNotification();
+  int ContextDisposedNotification(bool dependant_context = true);
 
   /**
    * Allows the host application to provide the address of a function that is