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

tools/gn/config_values_extractors_unittest.cc

Index: tools/gn/config_values_extractors_unittest.cc
diff --git a/tools/gn/config_values_extractors_unittest.cc b/tools/gn/config_values_extractors_unittest.cc
index b8875eafa854385c7a4ad6a43b8a34e49c8b4991..05aa0530c0d8322e8b51c2775c788bbdf21fe0ea 100644
--- a/tools/gn/config_values_extractors_unittest.cc
+++ b/tools/gn/config_values_extractors_unittest.cc
@@ -35,18 +35,19 @@ TEST(ConfigValuesExtractors, IncludeOrdering) {
   // (uniquified) to each one so we can check what comes out the other end.
 
   // Set up dep2, direct and all dependent configs.
-  Config dep2_all(setup.settings(), Label(SourceDir("//dep2/"), "all"));
+  Config dep2_all(setup.settings(), Label(SourceDir("//dep2/"), "all"), {});
   dep2_all.own_values().cflags().push_back("--dep2-all");
   dep2_all.own_values().include_dirs().push_back(SourceDir("//dep2/all/"));
   ASSERT_TRUE(dep2_all.OnResolved(&err));
 
-  Config dep2_direct(setup.settings(), Label(SourceDir("//dep2/"), "direct"));
+  Config dep2_direct(setup.settings(), Label(SourceDir("//dep2/"), "direct"),
+                     {});
   dep2_direct.own_values().cflags().push_back("--dep2-direct");
   dep2_direct.own_values().include_dirs().push_back(
       SourceDir("//dep2/direct/"));
   ASSERT_TRUE(dep2_direct.OnResolved(&err));
 
-  Target dep2(setup.settings(), Label(SourceDir("//dep2/"), "dep2"));
+  Target dep2(setup.settings(), Label(SourceDir("//dep2/"), "dep2"), {});
   dep2.set_output_type(Target::SOURCE_SET);
   dep2.visibility().SetPublic();
   dep2.SetToolchain(setup.toolchain());
@@ -55,23 +56,25 @@ TEST(ConfigValuesExtractors, IncludeOrdering) {
 
   // Set up dep1, direct and all dependent configs. Also set up a subconfig
   // on "dep1_all" to test sub configs.
-  Config dep1_all_sub(setup.settings(), Label(SourceDir("//dep1"), "allch"));
+  Config dep1_all_sub(setup.settings(), Label(SourceDir("//dep1"), "allch"),
+                      {});
   dep1_all_sub.own_values().cflags().push_back("--dep1-all-sub");
   ASSERT_TRUE(dep1_all_sub.OnResolved(&err));
 
-  Config dep1_all(setup.settings(), Label(SourceDir("//dep1/"), "all"));
+  Config dep1_all(setup.settings(), Label(SourceDir("//dep1/"), "all"), {});
   dep1_all.own_values().cflags().push_back("--dep1-all");
   dep1_all.own_values().include_dirs().push_back(SourceDir("//dep1/all/"));
   dep1_all.configs().push_back(LabelConfigPair(&dep1_all_sub));
   ASSERT_TRUE(dep1_all.OnResolved(&err));
 
-  Config dep1_direct(setup.settings(), Label(SourceDir("//dep1/"), "direct"));
+  Config dep1_direct(setup.settings(), Label(SourceDir("//dep1/"), "direct"),
+                     {});
   dep1_direct.own_values().cflags().push_back("--dep1-direct");
   dep1_direct.own_values().include_dirs().push_back(
       SourceDir("//dep1/direct/"));
   ASSERT_TRUE(dep1_direct.OnResolved(&err));
 
-  Target dep1(setup.settings(), Label(SourceDir("//dep1/"), "dep1"));
+  Target dep1(setup.settings(), Label(SourceDir("//dep1/"), "dep1"), {});
   dep1.set_output_type(Target::SOURCE_SET);
   dep1.visibility().SetPublic();
   dep1.SetToolchain(setup.toolchain());
@@ -80,13 +83,13 @@ TEST(ConfigValuesExtractors, IncludeOrdering) {
   dep1.private_deps().push_back(LabelTargetPair(&dep2));
 
   // Set up target, direct and all dependent configs.
-  Config target_all(setup.settings(), Label(SourceDir("//target/"), "all"));
+  Config target_all(setup.settings(), Label(SourceDir("//target/"), "all"), {});
   target_all.own_values().cflags().push_back("--target-all");
   target_all.own_values().include_dirs().push_back(SourceDir("//target/all/"));
   ASSERT_TRUE(target_all.OnResolved(&err));
 
   Config target_direct(setup.settings(),
-                       Label(SourceDir("//target/"), "direct"));
+                       Label(SourceDir("//target/"), "direct"), {});
   target_direct.own_values().cflags().push_back("--target-direct");
   target_direct.own_values().include_dirs().push_back(
       SourceDir("//target/direct/"));
@@ -94,13 +97,13 @@ TEST(ConfigValuesExtractors, IncludeOrdering) {
 
   // This config is applied directly to target.
   Config target_config(setup.settings(),
-                       Label(SourceDir("//target/"), "config"));
+                       Label(SourceDir("//target/"), "config"), {});
   target_config.own_values().cflags().push_back("--target-config");
   target_config.own_values().include_dirs().push_back(
       SourceDir("//target/config/"));
   ASSERT_TRUE(target_config.OnResolved(&err));
 
-  Target target(setup.settings(), Label(SourceDir("//target/"), "target"));
+  Target target(setup.settings(), Label(SourceDir("//target/"), "target"), {});
   target.set_output_type(Target::SOURCE_SET);
   target.SetToolchain(setup.toolchain());
   target.all_dependent_configs().push_back(LabelConfigPair(&target_all));