GN: Separately track labels and origins for lists of stuff

tools/gn/ninja_target_writer.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 "tools/gn/ninja_target_writer.h"
 
 #include <fstream>
 #include <sstream>
 
 #include "base/file_util.h"
@@ skipping 84 matching lines @@
 
   // Input files are order-only deps.
   const Target::FileList& prereqs = target_->source_prereqs();
   bool has_files = !prereqs.empty();
   for (size_t i = 0; i < prereqs.size(); i++) {
     ret << " ";
     path_output_.WriteFile(ret, prereqs[i]);
   }
 
   // Add on any direct deps marked as "hard".
-  const std::vector<const Target*>& deps = target_->deps();
+  const LabelTargetVector& deps = target_->deps();
   for (size_t i = 0; i < deps.size(); i++) {
-    if (deps[i]->hard_dep()) {
+    if (deps[i].ptr->hard_dep()) {
       has_files = true;
       ret << " ";
-      path_output_.WriteFile(ret, helper_.GetTargetOutputFile(deps[i]));
+      path_output_.WriteFile(ret, helper_.GetTargetOutputFile(deps[i].ptr));
     }
   }
 
   if (has_files)
     return ret.str();
   return std::string();  // No files added.
 }
 
 FileTemplate NinjaTargetWriter::GetOutputTemplate() const {
   const Target::FileList& outputs = target_->script_values().outputs();
   std::vector<std::string> output_template_args;
   for (size_t i = 0; i < outputs.size(); i++) {
     // All outputs should be in the output dir.
     output_template_args.push_back(
         RemovePrefix(outputs[i].value(),
                      settings_->build_settings()->build_dir().value()));
   }
   return FileTemplate(output_template_args);
 }