Add directory extraction to GN path handling.

tools/gn/command_desc.cc

 // 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.
 
 #include <algorithm>
 #include <set>
 #include <sstream>
 
 #include "base/command_line.h"
 #include "tools/gn/commands.h"
@@ skipping 258 matching lines @@
     // Display the pattern.
     OutputString("  Output pattern:\n");
     PrintFileList(target->action_values().outputs(), "", true, false);
 
     // Now display what that resolves to given the sources.
     OutputString("\n  Resolved output file list:\n");
 
     std::vector<std::string> output_strings;
     FileTemplate file_template = FileTemplate::GetForTargetOutputs(target);
     for (size_t i = 0; i < target->sources().size(); i++)
-      file_template.ApplyString(target->sources()[i].value(), &output_strings);
+      file_template.Apply(target->sources()[i], &output_strings);
 
     std::sort(output_strings.begin(), output_strings.end());
     for (size_t i = 0; i < output_strings.size(); i++) {
       OutputString("    " + output_strings[i] + "\n");
     }
   }
 }
 
 void PrintScript(const Target* target, bool display_header) {
   if (display_header)
@@ skipping 303 matching lines @@
   // so always display them, even for groups and such.
   PrintLibs(target, true);
   PrintLibDirs(target, true);
 
   PrintDeps(target, true);
 
   return 0;
 }
 
 }  // namespace commands