[bootstrapper] add checks for variable bindings in native scripts.

src/parsing/parser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_PARSER_H_
 #define V8_PARSING_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
@@ skipping 133 matching lines @@
     set_strong_mode(language_mode & STRONG_BIT);
   }
 
   void ReopenHandlesInNewHandleScope() {
     closure_ = Handle<JSFunction>(*closure_);
     shared_ = Handle<SharedFunctionInfo>(*shared_);
     script_ = Handle<Script>(*script_);
     context_ = Handle<Context>(*context_);
   }
 
+#ifdef DEBUG
+  bool script_is_native() { return script_->type() == Script::TYPE_NATIVE; }
+#endif  // DEBUG
+
  private:
   // Various configuration flags for parsing.
   enum Flag {
     // ---------- Input flags ---------------------------
     kToplevel = 1 << 0,
     kLazy = 1 << 1,
     kEval = 1 << 2,
     kGlobal = 1 << 3,
     kStrictMode = 1 << 4,
     kStrongMode = 1 << 5,
@@ skipping 1239 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_