Hook up symbol files to the Windows GN build.

tools/gn/path_output_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 <sstream>
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "tools/gn/output_file.h"
 #include "tools/gn/path_output.h"
 #include "tools/gn/source_dir.h"
 #include "tools/gn/source_file.h"
 
 TEST(PathOutput, Basic) {
   SourceDir build_dir("//out/Debug/");
   PathOutput writer(build_dir, ESCAPE_NONE);
   {
     // Normal source-root path.
     std::ostringstream out;
@@ skipping 188 matching lines @@
     {
       std::ostringstream out;
       writer.WriteDir(out, SourceDir("/"),
                       PathOutput::DIR_NO_LAST_SLASH);
       EXPECT_EQ("/.", out.str());
     }
 
     // Output inside current dir.
     {
       std::ostringstream out;
-
-
       writer.WriteDir(out, SourceDir("//out/Debug/"),
                       PathOutput::DIR_INCLUDE_LAST_SLASH);
       EXPECT_EQ("./", out.str());
     }
     {
       std::ostringstream out;
       writer.WriteDir(out, SourceDir("//out/Debug/"),
                       PathOutput::DIR_NO_LAST_SLASH);
       EXPECT_EQ(".", out.str());
     }
     {
       std::ostringstream out;
       writer.WriteDir(out, SourceDir("//out/Debug/foo/"),
                       PathOutput::DIR_INCLUDE_LAST_SLASH);
       EXPECT_EQ("foo/", out.str());
     }
     {
       std::ostringstream out;
       writer.WriteDir(out, SourceDir("//out/Debug/foo/"),
                       PathOutput::DIR_NO_LAST_SLASH);
       EXPECT_EQ("foo", out.str());
     }
+
+    // WriteDir using an OutputFile.
+    {
+      std::ostringstream out;
+      writer.WriteDir(out, OutputFile("foo/"),
+                      PathOutput::DIR_INCLUDE_LAST_SLASH);
+      EXPECT_EQ("foo/", out.str());
+    }
+    {
+      std::ostringstream out;
+      writer.WriteDir(out, OutputFile("foo/"),
+                      PathOutput::DIR_NO_LAST_SLASH);
+      EXPECT_EQ("foo", out.str());
+    }
+    {
+      std::ostringstream out;
+      writer.WriteDir(out, OutputFile(),
+                      PathOutput::DIR_INCLUDE_LAST_SLASH);
+      EXPECT_EQ("", out.str());
+    }
   }
   {
     // Empty build dir writer.
     PathOutput root_writer(SourceDir("//"), ESCAPE_NINJA);
     {
       std::ostringstream out;
       root_writer.WriteDir(out, SourceDir("//"),
                            PathOutput::DIR_INCLUDE_LAST_SLASH);
       EXPECT_EQ("./", out.str());
     }
     {
       std::ostringstream out;
       root_writer.WriteDir(out, SourceDir("//"),
                            PathOutput::DIR_NO_LAST_SLASH);
       EXPECT_EQ(".", out.str());
     }
   }
 }