Add "." accessors to GN.

tools/gn/token.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_TOKEN_H_
 #define TOOLS_GN_TOKEN_H_
 
 #include "base/strings/string_piece.h"
 #include "tools/gn/location.h"
 
@@ skipping 14 matching lines @@
     MINUS_EQUALS,
     EQUAL_EQUAL,
     NOT_EQUAL,
     LESS_EQUAL,
     GREATER_EQUAL,
     LESS_THAN,
     GREATER_THAN,
     BOOLEAN_AND,
     BOOLEAN_OR,
     BANG,
+    DOT,
 
     LEFT_PAREN,
     RIGHT_PAREN,
     LEFT_BRACKET,
     RIGHT_BRACKET,
     LEFT_BRACE,
     RIGHT_BRACE,
 
     IF,
     ELSE,
@@ skipping 27 matching lines @@
   // unescaping).
   std::string StringValue() const;
 
  private:
   Type type_;
   base::StringPiece value_;
   Location location_;
 };
 
 #endif  // TOOLS_GN_TOKEN_H_