Support script response files in GN.

tools/gn/action_values.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_ACTION_VALUES_H_
 #define TOOLS_GN_ACTION_VALUES_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 25 matching lines @@
 
   // Expands the outputs() above to the final SourceFile list.
   void GetOutputsAsSourceFiles(const Target* target,
                                std::vector<SourceFile>* result) const;
 
   // Depfile generated by the script.
   const SubstitutionPattern& depfile() const { return depfile_; }
   bool has_depfile() const { return !depfile_.ranges().empty(); }
   void set_depfile(const SubstitutionPattern& depfile) { depfile_ = depfile; }
 
+  // Response file contents. Empty means no response file.
+  SubstitutionList& rsp_file_contents() { return rsp_file_contents_; }
+  const SubstitutionList& rsp_file_contents() const {
+    return rsp_file_contents_;
+  }
+  bool uses_rsp_file() const { return !rsp_file_contents_.list().empty(); }
+
   // Console pool option
   bool is_console() const { return console_; }
   void set_console(bool value) { console_ = value; }
 
  private:
   SourceFile script_;
   SubstitutionList args_;
   SubstitutionList outputs_;
   SubstitutionPattern depfile_;
+  SubstitutionList rsp_file_contents_;
   bool console_;
 
   DISALLOW_COPY_AND_ASSIGN(ActionValues);
 };
 
 #endif  // TOOLS_GN_ACTION_VALUES_H_