Add API to create a "remote" instance of a given FunctionTemplate

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 9df6bbb42c44a75d0522ac19b4037b884615180d..4eb7614210fd1fb3120428e65f7c9ed97394f3b9 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4521,6 +4521,15 @@ class V8_EXPORT FunctionTemplate : public Template {
       Local<Context> context);
 
   /**
+   * Similar to Context::NewRemoteContext, this creates an instance that
+   * isn't backed by an actual object.
+   *
+   * The InstanceTemplate of this FunctionTemplate must have access checks with
+   * handlers installed.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewRemoteInstance();
+
+  /**
    * Set the call-handler callback for a FunctionTemplate.  This
    * callback is called whenever the function created from this
    * FunctionTemplate is called.