Hook up symbol files to the Windows GN build.

tools/gn/path_output.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_PATH_OUTPUT_H_
 #define TOOLS_GN_PATH_OUTPUT_H_
 
 #include <iosfwd>
 #include <string>
 
@@ skipping 31 matching lines @@
   const SourceDir& current_dir() const { return current_dir_; }
 
   // Getter/setters for flags inside the escape options.
   bool inhibit_quoting() const { return options_.inhibit_quoting; }
   void set_inhibit_quoting(bool iq) { options_.inhibit_quoting = iq; }
   void set_escape_platform(EscapingPlatform p) { options_.platform = p; }
 
   void WriteFile(std::ostream& out, const SourceFile& file) const;
   void WriteFile(std::ostream& out, const OutputFile& file) const;
   void WriteFile(std::ostream& out, const base::FilePath& file) const;
+
+  // This variant assumes the dir ends in a trailing slash or is empty.
   void WriteDir(std::ostream& out,
                 const SourceDir& dir,
                 DirSlashEnding slash_ending) const;
 
+  void WriteDir(std::ostream& out,
+                const OutputFile& file,
+                DirSlashEnding slash_ending) const;
+
   // Backend for WriteFile and WriteDir. This appends the given file or
   // directory string to the file.
   void WritePathStr(std::ostream& out, const base::StringPiece& str) const;
 
  private:
   // Takes the given string and writes it out, appending to the inverse
   // current dir. This assumes leading slashes have been trimmed.
   void WriteSourceRelativeString(std::ostream& out,
                                  const base::StringPiece& str) const;
 
   SourceDir current_dir_;
 
   // Uses system slashes if convert_slashes_to_system_.
   std::string inverse_current_dir_;
 
   // Since the inverse_current_dir_ depends on some of these, we don't expose
   // this directly to modification.
   EscapeOptions options_;
 };
 
 #endif  // TOOLS_GN_PATH_OUTPUT_H_