Support spaces in Mac GN build output names.

tools/gn/substitution_writer_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 <sstream>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/err.h"
 #include "tools/gn/escape.h"
 #include "tools/gn/substitution_list.h"
@@ skipping 175 matching lines @@
   target.set_output_type(Target::STATIC_LIBRARY);
   target.SetToolchain(setup.toolchain());
   ASSERT_TRUE(target.OnResolved(&err));
 
   std::string result;
   EXPECT_TRUE(SubstitutionWriter::GetTargetSubstitution(
       &target, SUBSTITUTION_LABEL, &result));
   EXPECT_EQ("//foo/bar:baz", result);
 
   EXPECT_TRUE(SubstitutionWriter::GetTargetSubstitution(
+      &target, SUBSTITUTION_LABEL_NAME, &result));
+  EXPECT_EQ("baz", result);
+
+  EXPECT_TRUE(SubstitutionWriter::GetTargetSubstitution(
       &target, SUBSTITUTION_ROOT_GEN_DIR, &result));
   EXPECT_EQ("gen", result);
 
   EXPECT_TRUE(SubstitutionWriter::GetTargetSubstitution(
       &target, SUBSTITUTION_ROOT_OUT_DIR, &result));
   EXPECT_EQ(".", result);
 
   EXPECT_TRUE(SubstitutionWriter::GetTargetSubstitution(
       &target, SUBSTITUTION_TARGET_GEN_DIR, &result));
   EXPECT_EQ("gen/foo/bar", result);
@@ skipping 51 matching lines @@
   // Test that we handle paths that end up in the root build dir properly
   // (no leading "./" or "/").
   SubstitutionPattern pattern;
   ASSERT_TRUE(pattern.Parse("{{root_out_dir}}/{{target_output_name}}.so",
                             nullptr, &err));
 
   OutputFile output = SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
       &target, tool, pattern);
   EXPECT_EQ("./libbaz.so", output.value());
 }