Add directory extraction to GN path handling.

tools/gn/ninja_action_target_writer_unittest.cc

 // Copyright (c) 2013 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 <algorithm>
 #include <sstream>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/file_template.h"
 #include "tools/gn/ninja_action_target_writer.h"
@@ skipping 26 matching lines @@
   setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
   Target target(setup.settings(), Label(SourceDir("//foo/"), "bar"));
 
   std::ostringstream out;
   NinjaActionTargetWriter writer(&target, setup.toolchain(), out);
 
   std::vector<std::string> args;
   args.push_back("-i");
   args.push_back("{{source}}");
   args.push_back("--out=foo bar{{source_name_part}}.o");
-  FileTemplate args_template(args);
+  FileTemplate args_template(setup.settings(), args);
 
   writer.WriteArgsSubstitutions(SourceFile("//foo/b ar.in"), args_template);
 #if defined(OS_WIN)
   EXPECT_EQ("  source = \"../../foo/b$ ar.in\"\n"
             "  source_name_part = \"b$ ar\"\n",
             out.str());
 #else
   EXPECT_EQ("  source = ../../foo/b\\$ ar.in\n"
             "  source_name_part = b\\$ ar\n",
             out.str());
@@ skipping 286 matching lines @@
             " | obj/foo/bar.inputdeps.stamp\n"
         "  unique_name = 1\n"
         "  source = ../../foo/input2.txt\n"
         "  source_name_part = input2\n"
         "  depfile = gen/input2.d\n"
         "\n"
         "build obj/foo/bar.stamp: stamp input1.out input2.out\n";
     EXPECT_EQ(expected_win, out.str());
   }
 }