Make get_label_info take into account the toolchain for target_gen_dir

tools/gn/function_get_label_info_unittest.cc

 // Copyright 2014 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 "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/functions.h"
 #include "tools/gn/test_with_scope.h"
 
 namespace {
 
@@ skipping 55 matching lines @@
 TEST_F(GetLabelInfoTest, RootGenDir) {
   EXPECT_EQ("//out/Debug/gen", Call(":name", "root_gen_dir"));
   EXPECT_EQ("//out/Debug/gen",
             Call(":name(//toolchain:default)", "root_gen_dir"));
   EXPECT_EQ("//out/Debug/random/gen",
             Call(":name(//toolchain:random)", "root_gen_dir"));
 }
 
 TEST_F(GetLabelInfoTest, TargetOutDir) {
   EXPECT_EQ("//out/Debug/obj/src/foo", Call(":name", "target_out_dir"));
-  EXPECT_EQ("//out/Debug", Call(":name", "root_out_dir"));
-
   EXPECT_EQ("//out/Debug/obj/foo",
             Call("//foo:name(//toolchain:default)", "target_out_dir"));
   EXPECT_EQ("//out/Debug/random/obj/foo",
             Call("//foo:name(//toolchain:random)", "target_out_dir"));
 }
 
+TEST_F(GetLabelInfoTest, TargetGenDir) {
+  EXPECT_EQ("//out/Debug/gen/src/foo", Call(":name", "target_gen_dir"));
+  EXPECT_EQ("//out/Debug/gen/foo",
+            Call("//foo:name(//toolchain:default)", "target_gen_dir"));
+  EXPECT_EQ("//out/Debug/random/gen/foo",
+            Call("//foo:name(//toolchain:random)", "target_gen_dir"));
+}
+
 TEST_F(GetLabelInfoTest, LabelNoToolchain) {
   EXPECT_EQ("//src/foo:name", Call(":name", "label_no_toolchain"));
   EXPECT_EQ("//src/foo:name",
             Call("//src/foo:name(//toolchain:random)", "label_no_toolchain"));
 }
 
 TEST_F(GetLabelInfoTest, LabelWithToolchain) {
   EXPECT_EQ("//src/foo:name(//toolchain:default)",
             Call(":name", "label_with_toolchain"));
   EXPECT_EQ("//src/foo:name(//toolchain:random)",
             Call(":name(//toolchain:random)", "label_with_toolchain"));
 }
 
 TEST_F(GetLabelInfoTest, Toolchain) {
   EXPECT_EQ("//toolchain:default", Call(":name", "toolchain"));
   EXPECT_EQ("//toolchain:random",
             Call(":name(//toolchain:random)", "toolchain"));
 }