Get information about original function from bound function

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index aee9e3a469eae454a9fdc7b241142050044a730a..03c40a53d22453809646b272c065875e35cafb2e 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -4305,6 +4305,20 @@ int Function::ScriptId() const {
 }
 
 
+Local<v8::Function> Function::GetBoundFunction() const {
+  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
+  if (!func->shared()->bound()) {
+    return Utils::ToLocal(func);
+  }
+  i::Handle<i::FixedArray> bound_args = i::Handle<i::FixedArray>(
+      i::FixedArray::cast(func->function_bindings()));
+  i::Handle<i::Object> original(
+      i::JSReceiver::cast(bound_args->get(i::JSFunction::kBoundFunctionIndex)),
+      i::Isolate::Current());
+  return Utils::ToLocal(i::Handle<i::JSFunction>::cast(original));
+}
+
+
 int String::Length() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
   return str->length();