Support for source_target_relative expansion in GN

tools/gn/action_values.cc

Index: tools/gn/action_values.cc
diff --git a/tools/gn/action_values.cc b/tools/gn/action_values.cc
index a7ce83da056447c4b84c85a2b39c55712505d643..28c4a11e0cbf2c86dfdfdf9ba7cba8f9f01d1e6b 100644
--- a/tools/gn/action_values.cc
+++ b/tools/gn/action_values.cc
@@ -22,7 +22,7 @@ void ActionValues::GetOutputsAsSourceFiles(
       target->output_type() == Target::ACTION_FOREACH) {
     // Copy and foreach applies the outputs to the sources.
     SubstitutionWriter::ApplyListToSources(
-        target->settings(), outputs_, target->sources(), result);
+        target, target->settings(), outputs_, target->sources(), result);
   } else {
     // Actions (and anything else that happens to specify an output) just use
     // the output list with no substitution.