Add outputs to GN's header checker.

tools/gn/function_get_target_outputs.cc

 // Copyright 2014 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/build_settings.h"
 #include "tools/gn/functions.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/settings.h"
 #include "tools/gn/substitution_writer.h"
 #include "tools/gn/target.h"
@@ skipping 100 matching lines @@
   if (!target) {
     *err = Err(function, "Target not found in this context.",
         label.GetUserVisibleName(false) +
         "\nwas not found. get_target_outputs() can only be used for targets\n"
         "previously defined in the current file.");
     return Value();
   }
 
   // Compute the output list.
   std::vector<SourceFile> files;
-  if (target->output_type() == Target::ACTION) {
-    // Actions just use the output list with no substitution.
-    SubstitutionWriter::GetListAsSourceFiles(
-        target->action_values().outputs(), &files);
-  } else if (target->output_type() == Target::COPY_FILES ||
-             target->output_type() == Target::ACTION_FOREACH) {
-    // Copy and foreach appllies the outputs to the sources.
-    SubstitutionWriter::ApplyListToSources(
-        target->settings(), target->action_values().outputs(),
-        target->sources(), &files);
+  if (target->output_type() == Target::ACTION ||
+      target->output_type() == Target::COPY_FILES ||
+      target->output_type() == Target::ACTION_FOREACH) {
+    target->action_values().GetOutputsAsSourceFiles(target, &files);
   } else {
     // Other types of targets are not supported.
     *err = Err(args[0], "Target is not an action, action_foreach, or copy.",
                "Only these target types are supported by get_target_outputs.");
     return Value();
   }
 
   // Convert to Values.
   Value ret(function, Value::LIST);
   ret.list_value().reserve(files.size());
   for (size_t i = 0; i < files.size(); i++)
     ret.list_value().push_back(Value(function, files[i].value()));
 
   return ret;
 }
 
 }  // namespace functions