Add "." accessors to GN.

tools/gn/parser.h

 // Copyright (c) 2013 The Chromium 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 TOOLS_GN_PARSER_H_
 #define TOOLS_GN_PARSER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 43 matching lines @@
   scoped_ptr<ParseNode> Group(Token token);
   scoped_ptr<ParseNode> Not(Token token);
   scoped_ptr<ParseNode> List(Token token);
 
   // |InfixFunc|s used in parsing expressions.
   scoped_ptr<ParseNode> BinaryOperator(scoped_ptr<ParseNode> left, Token token);
   scoped_ptr<ParseNode> IdentifierOrCall(scoped_ptr<ParseNode> left,
                                          Token token);
   scoped_ptr<ParseNode> Assignment(scoped_ptr<ParseNode> left, Token token);
   scoped_ptr<ParseNode> Subscript(scoped_ptr<ParseNode> left, Token token);
+  scoped_ptr<ParseNode> DotOperator(scoped_ptr<ParseNode> left, Token token);
 
   // Helper to parse a comma separated list, optionally allowing trailing
   // commas (allowed in [] lists, not in function calls).
   scoped_ptr<ListNode> ParseList(Token::Type stop_before,
                                  bool allow_trailing_comma);
 
   scoped_ptr<ParseNode> ParseFile();
   scoped_ptr<ParseNode> ParseStatement();
   scoped_ptr<BlockNode> ParseBlock();
   scoped_ptr<ParseNode> ParseCondition();
@@ skipping 30 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(Parser, Expression);
   FRIEND_TEST_ALL_PREFIXES(Parser, FunctionCall);
   FRIEND_TEST_ALL_PREFIXES(Parser, List);
   FRIEND_TEST_ALL_PREFIXES(Parser, ParenExpression);
   FRIEND_TEST_ALL_PREFIXES(Parser, UnaryOp);
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 #endif  // TOOLS_GN_PARSER_H_