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

tools/gn/ninja_target_writer_unittest.cc

Index: tools/gn/ninja_target_writer_unittest.cc
diff --git a/tools/gn/ninja_target_writer_unittest.cc b/tools/gn/ninja_target_writer_unittest.cc
index 55bbde05db5aaa9bf054076138897b0cbe81d8f1..6bc2866458d7335ef2ca4941aa9cd321cccb3c43 100644
--- a/tools/gn/ninja_target_writer_unittest.cc
+++ b/tools/gn/ninja_target_writer_unittest.cc
@@ -35,7 +35,7 @@ TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDep) {
   Err err;
 
   // Make a base target that's a hard dep (action).
-  Target base_target(setup.settings(), Label(SourceDir("//foo/"), "base"));
+  Target base_target(setup.settings(), Label(SourceDir("//foo/"), "base"), {});
   base_target.set_output_type(Target::ACTION);
   base_target.visibility().SetPublic();
   base_target.SetToolchain(setup.toolchain());
@@ -43,7 +43,7 @@ TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDep) {
 
   // Dependent target that also includes a source prerequisite (should get
   // included) and a source (should not be included).
-  Target target(setup.settings(), Label(SourceDir("//foo/"), "target"));
+  Target target(setup.settings(), Label(SourceDir("//foo/"), "target"), {});
   target.set_output_type(Target::EXECUTABLE);
   target.visibility().SetPublic();
   target.SetToolchain(setup.toolchain());
@@ -53,7 +53,7 @@ TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDep) {
 
   // Dependent action to test that action sources will be treated the same as
   // inputs.
-  Target action(setup.settings(), Label(SourceDir("//foo/"), "action"));
+  Target action(setup.settings(), Label(SourceDir("//foo/"), "action"), {});
   action.set_output_type(Target::ACTION);
   action.visibility().SetPublic();
   action.SetToolchain(setup.toolchain());
@@ -115,14 +115,14 @@ TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDepWithToolchainDeps) {
   // because it would be a circular dependency (the target depends on its
   // toolchain, and the toolchain depends on this target).
   Target toolchain_dep_target(setup.settings(),
-                              Label(SourceDir("//foo/"), "setup"));
+                              Label(SourceDir("//foo/"), "setup"), {});
   toolchain_dep_target.set_output_type(Target::ACTION);
   toolchain_dep_target.SetToolchain(setup.toolchain());
   ASSERT_TRUE(toolchain_dep_target.OnResolved(&err));
   setup.toolchain()->deps().push_back(LabelTargetPair(&toolchain_dep_target));
 
   // Make a binary target
-  Target target(setup.settings(), Label(SourceDir("//foo/"), "target"));
+  Target target(setup.settings(), Label(SourceDir("//foo/"), "target"), {});
   target.set_output_type(Target::EXECUTABLE);
   target.SetToolchain(setup.toolchain());
   ASSERT_TRUE(target.OnResolved(&err));