[parser] Add convenient Print function for debugging.

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 1099 matching lines @@
 
   PendingCompilationErrorHandler pending_error_handler_;
 
   // Other information which will be stored in Parser and moved to Isolate after
   // parsing.
   int use_counts_[v8::Isolate::kUseCounterFeatureCount];
   int total_preparse_skipped_;
   HistogramTimer* pre_parse_timer_;
 
   bool parsing_on_main_thread_;
+
+#ifdef DEBUG
+  void Print(AstNode* node);
+#endif  // DEBUG
 };
 
 
 bool ParserTraits::IsFutureStrictReserved(
     const AstRawString* identifier) const {
   return parser_->scanner()->IdentifierIsFutureStrictReserved(identifier);
 }
 
 
 Scope* ParserTraits::NewScope(Scope* parent_scope, ScopeType scope_type,
@@ skipping 164 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_