Chain ScopeInfos together

src/ast/scopes.h

Index: src/ast/scopes.h
diff --git a/src/ast/scopes.h b/src/ast/scopes.h
index 8a84664c18ec44d657ebc85db9208c98d3b66c5f..1aa6a3988a72c644ba4495b93e7b8cdf92edbe2f 100644
--- a/src/ast/scopes.h
+++ b/src/ast/scopes.h
@@ -331,6 +331,9 @@ class Scope: public ZoneObject {
   // The scope immediately surrounding this scope, or NULL.
   Scope* outer_scope() const { return outer_scope_; }
 
+  // The innermost outer scope that needs a context or nullptr.
+  Scope* GetOuterScopeWithContext() const;
+
   const AstRawString* catch_variable_name() const {
     DCHECK(is_catch_scope());
     DCHECK_EQ(1, num_var());