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

tools/gn/target_generator.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/target_generator.h"
 
 #include <stddef.h>
 
 #include "tools/gn/action_target_generator.h"
 #include "tools/gn/binary_target_generator.h"
@@ skipping 70 matching lines @@
 
   // The location of the target is the directory name with no slash at the end.
   // FIXME(brettw) validate name.
   const Label& toolchain_label = ToolchainLabelForScope(scope);
   Label label(scope->GetSourceDir(), args[0].string_value(),
               toolchain_label.dir(), toolchain_label.name());
 
   if (g_scheduler->verbose_logging())
     g_scheduler->Log("Defining target", label.GetUserVisibleName(true));
 
-  std::unique_ptr<Target> target(new Target(scope->settings(), label));
+  std::unique_ptr<Target> target(
+      new Target(scope->settings(), label, scope->input_files()));
   target->set_defined_from(function_call);
 
   // Create and call out to the proper generator.
   if (output_type == functions::kBundleData) {
     BundleDataTargetGenerator generator(
         target.get(), scope, function_call, err);
     generator.Run();
   } else if (output_type == functions::kCreateBundle) {
     CreateBundleTargetGenerator generator(target.get(), scope, function_call,
                                           err);
@@ skipping 297 matching lines @@
   if (err_->has_error())
     return false;
   if (!EnsureStringIsInOutputDir(GetBuildSettings()->build_dir(),
           source_file.value(), value->origin(), err_))
     return false;
   OutputFile output_file(GetBuildSettings(), source_file);
   target_->set_write_runtime_deps_output(output_file);
 
   return true;
 }