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

tools/gn/builder_unittest.cc

Index: tools/gn/builder_unittest.cc
diff --git a/tools/gn/builder_unittest.cc b/tools/gn/builder_unittest.cc
index 616e76ae9df0f00355a21f9a8281cb62a70c9e5a..30d4e787dee55d3ac0ce5bcadec0d53aced81fd9 100644
--- a/tools/gn/builder_unittest.cc
+++ b/tools/gn/builder_unittest.cc
@@ -69,14 +69,14 @@ class BuilderTest : public testing::Test {
       : loader_(new MockLoader),
         builder_(loader_.get()),
         settings_(&build_settings_, std::string()),
-        scope_(&settings_) {
+        scope_(&settings_, {}) {
     build_settings_.SetBuildDir(SourceDir("//out/"));
     settings_.set_toolchain_label(Label(SourceDir("//tc/"), "default"));
     settings_.set_default_toolchain_label(settings_.toolchain_label());
   }
 
   Toolchain* DefineToolchain() {
-    Toolchain* tc = new Toolchain(&settings_, settings_.toolchain_label());
+    Toolchain* tc = new Toolchain(&settings_, settings_.toolchain_label(), {});
     TestWithScope::SetupToolchain(tc);
     builder_.ItemDefined(std::unique_ptr<Item>(tc));
     return tc;
@@ -104,7 +104,7 @@ TEST_F(BuilderTest, BasicDeps) {
   Label c_label(SourceDir("//c/"), "c", toolchain_dir, toolchain_name);
 
   // The builder will take ownership of the pointers.
-  Target* a = new Target(&settings_, a_label);
+  Target* a = new Target(&settings_, a_label, {});
   a->public_deps().push_back(LabelTargetPair(b_label));
   a->set_output_type(Target::EXECUTABLE);
   builder_.ItemDefined(std::unique_ptr<Item>(a));
@@ -149,7 +149,7 @@ TEST_F(BuilderTest, BasicDeps) {
             b_record->waiting_on_resolution().find(a_record));
 
   // Add the C target.
-  Target* c = new Target(&settings_, c_label);
+  Target* c = new Target(&settings_, c_label, {});
   c->set_output_type(Target::STATIC_LIBRARY);
   c->visibility().SetPublic();
   builder_.ItemDefined(std::unique_ptr<Item>(c));
@@ -159,7 +159,7 @@ TEST_F(BuilderTest, BasicDeps) {
   EXPECT_TRUE(loader_->HasLoadedNone());
 
   // Add the B target.
-  Target* b = new Target(&settings_, b_label);
+  Target* b = new Target(&settings_, b_label, {});
   a->public_deps().push_back(LabelTargetPair(c_label));
   b->set_output_type(Target::SHARED_LIBRARY);
   b->visibility().SetPublic();
@@ -192,7 +192,7 @@ TEST_F(BuilderTest, ShouldGenerate) {
   Settings settings2(&build_settings_, "secondary/");
   Label toolchain_label2(SourceDir("//tc/"), "secondary");
   settings2.set_toolchain_label(toolchain_label2);
-  Toolchain* tc2 = new Toolchain(&settings2, toolchain_label2);
+  Toolchain* tc2 = new Toolchain(&settings2, toolchain_label2, {});
   TestWithScope::SetupToolchain(tc2);
   builder_.ItemDefined(std::unique_ptr<Item>(tc2));
 
@@ -204,7 +204,7 @@ TEST_F(BuilderTest, ShouldGenerate) {
                 toolchain_label2.dir(), toolchain_label2.name());
 
   // First define B.
-  Target* b = new Target(&settings2, b_label);
+  Target* b = new Target(&settings2, b_label, {});
   b->visibility().SetPublic();
   b->set_output_type(Target::EXECUTABLE);
   builder_.ItemDefined(std::unique_ptr<Item>(b));
@@ -214,7 +214,7 @@ TEST_F(BuilderTest, ShouldGenerate) {
   EXPECT_FALSE(b_record->should_generate());
 
   // Define A with a dependency on B.
-  Target* a = new Target(&settings_, a_label);
+  Target* a = new Target(&settings_, a_label, {});
   a->public_deps().push_back(LabelTargetPair(b_label));
   a->set_output_type(Target::EXECUTABLE);
   builder_.ItemDefined(std::unique_ptr<Item>(a));
@@ -240,7 +240,7 @@ TEST_F(BuilderTest, ConfigLoad) {
   Label c_label(SourceDir("//c/"), "c", toolchain_dir, toolchain_name);
 
   // The builder will take ownership of the pointers.
-  Config* a = new Config(&settings_, a_label);
+  Config* a = new Config(&settings_, a_label, {});
   a->configs().push_back(LabelConfigPair(b_label));
   builder_.ItemDefined(std::unique_ptr<Item>(a));