Implement tracking of BUILD.gn files used to define target, toolchain or

tools/gn/config.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/config.h"
 
 #include "tools/gn/err.h"
 #include "tools/gn/input_file_manager.h"
 #include "tools/gn/scheduler.h"
 
-Config::Config(const Settings* settings, const Label& label)
-    : Item(settings, label),
-      resolved_(false) {
-}
+Config::Config(const Settings* settings,
+               const Label& label,
+               const InputFileSet& input_files)
+    : Item(settings, label, input_files), resolved_(false) {}
 
 Config::~Config() {
 }
 
 Config* Config::AsConfig() {
   return this;
 }
 
 const Config* Config::AsConfig() const {
   return this;
@@ skipping 17 matching lines @@
     // targets. Do the same for Target.configs_ when a target is resolved. This
     // will naturally de-dupe and also prevents recursive config walking to
     // compute every possible flag, although it will expand the configs list on
     // a target nontrivially (depending on build configuration).
     composite_values_ = own_values_;
     for (const auto& pair : configs_)
       composite_values_.AppendValues(pair.ptr->resolved_values());
   }
   return true;
 }