Support for source_target_relative expansion in GN

tools/gn/ninja_action_target_writer.cc

Index: tools/gn/ninja_action_target_writer.cc
diff --git a/tools/gn/ninja_action_target_writer.cc b/tools/gn/ninja_action_target_writer.cc
index 17436323a92d25680c7160a4f96073a6c1e9ec88..77ee2b41ae6017105dc79ec845baa1518c8f8744 100644
--- a/tools/gn/ninja_action_target_writer.cc
+++ b/tools/gn/ninja_action_target_writer.cc
@@ -184,11 +184,11 @@ void NinjaActionTargetWriter::WriteSourceRules(
     // very unusual (normally the substitutions will go in one place or the
     // other) and the redundant assignment won't bother Ninja.
     SubstitutionWriter::WriteNinjaVariablesForSource(
-        settings_, sources[i],
+        target_, settings_, sources[i],
         target_->action_values().args().required_types(),
         args_escape_options, out_);
     SubstitutionWriter::WriteNinjaVariablesForSource(
-        settings_, sources[i],
+        target_, settings_, sources[i],
         target_->action_values().rsp_file_contents().required_types(),
         args_escape_options, out_);
 
@@ -206,7 +206,8 @@ void NinjaActionTargetWriter::WriteOutputFilesForBuildLine(
   size_t first_output_index = output_files->size();
 
   SubstitutionWriter::ApplyListToSourceAsOutputFile(
-      settings_, target_->action_values().outputs(), source, output_files);
+      target_, settings_, target_->action_values().outputs(), source,
+      output_files);
 
   for (size_t i = first_output_index; i < output_files->size(); i++) {
     out_ << " ";
@@ -217,5 +218,5 @@ void NinjaActionTargetWriter::WriteOutputFilesForBuildLine(
 void NinjaActionTargetWriter::WriteDepfile(const SourceFile& source) {
   path_output_.WriteFile(out_,
       SubstitutionWriter::ApplyPatternToSourceAsOutputFile(
-          settings_, target_->action_values().depfile(), source));
+          target_, settings_, target_->action_values().depfile(), source));
 }