Add a mode to completely deserialize scope chains

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 5c7442bb9e02188bbf8b51cbfec4cef4ade92526..1b408646fe1e75853cc72ad262f7f70b3f317079 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -717,6 +717,9 @@ class Parser : public ParserBase<ParserTraits> {
   bool Parse(ParseInfo* info);
   void ParseOnBackground(ParseInfo* info);
 
+  void DeserializeScopeChain(ParseInfo* info, Handle<Context> context,
+                             Scope::DeserializationMode deserialization_mode);
+
   // Handle errors detected during parsing, move statistics to Isolate,
   // internalize strings (move them to the heap).
   void Internalize(Isolate* isolate, Handle<Script> script, bool error);