Support for source_target_relative expansion in GN

tools/gn/desc_builder.cc

 // Copyright (c) 2016 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 <set>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/config.h"
@@ skipping 598 matching lines @@
                target_->output_type() == Target::COPY_FILES) {
       const SubstitutionList& outputs = target_->action_values().outputs();
       if (!outputs.required_types().empty()) {
         auto patterns = base::MakeUnique<base::ListValue>();
         for (const auto& elem : outputs.list())
           patterns->AppendString(elem.AsString());
 
         res->SetWithoutPathExpansion("output_patterns", std::move(patterns));
       }
       std::vector<SourceFile> output_files;
-      SubstitutionWriter::ApplyListToSources(target_->settings(), outputs,
-                                             target_->sources(), &output_files);
+      SubstitutionWriter::ApplyListToSources(target_, target_->settings(),
+                                             outputs, target_->sources(),
+                                             &output_files);
       res->SetWithoutPathExpansion(variables::kOutputs,
                                    RenderValue(output_files));
     } else {
       DCHECK(target_->IsBinary());
       const Tool* tool =
           target_->toolchain()->GetToolForTargetFinalOutput(target_);
 
       std::vector<OutputFile> output_files;
       SubstitutionWriter::ApplyListToLinkerAsOutputFile(
           target_, tool, tool->outputs(), &output_files);
@@ skipping 79 matching lines @@
 
 std::unique_ptr<base::DictionaryValue> DescBuilder::DescriptionForConfig(
     const Config* config,
     const std::string& what) {
   std::set<std::string> w;
   if (!what.empty())
     w.insert(what);
   ConfigDescBuilder b(config, w);
   return b.BuildDescription();
 }