Hook up symbol files to the Windows GN build.

tools/gn/path_output.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 "tools/gn/path_output.h"
 
 #include "build/build_config.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/output_file.h"
 #include "tools/gn/string_utils.h"
@@ skipping 57 matching lines @@
     WritePathStr(out, base::StringPiece(dir.value().data(),
                                         dir.value().size() - 1));
   }
 }
 
 void PathOutput::WriteFile(std::ostream& out, const OutputFile& file) const {
   // Here we assume that the path is already preprocessed.
   EscapeStringToStream(out, file.value(), options_);
 }
 
+void PathOutput::WriteDir(std::ostream& out,

[scottmg, 2014/07/17 21:57:19]

can you add to path_output_unittest.cc for this?

+                          const OutputFile& file,
+                          DirSlashEnding slash_ending) const {
+  switch (slash_ending) {
+    case DIR_INCLUDE_LAST_SLASH:
+      EscapeStringToStream(out, file.value(), options_);
+      break;
+    case DIR_NO_LAST_SLASH:
+      if (!file.value().empty() &&
+          file.value()[file.value().size() - 1] == '/') {
+        // Trim trailing slash.
+        EscapeStringToStream(
+            out,
+            base::StringPiece(file.value().data(), file.value().size() - 1),
+            options_);
+      } else {
+        // Doesn't end with a slash, write the whole thing.
+        EscapeStringToStream(out, file.value(), options_);
+      }
+      break;
+  }
+}
+
 void PathOutput::WriteFile(std::ostream& out,
                            const base::FilePath& file) const {
   // Assume native file paths are always absolute.
   EscapeStringToStream(out, FilePathToUTF8(file), options_);
 }
 
 void PathOutput::WriteSourceRelativeString(
     std::ostream& out,
     const base::StringPiece& str) const {
   if (options_.mode == ESCAPE_NINJA_COMMAND) {
@@ skipping 33 matching lines @@
     // it's system-absolute.
 #if defined(OS_WIN)
     // On Windows, trim the leading slash, since the input for absolute
     // paths will look like "/C:/foo/bar.txt".
     EscapeStringToStream(out, str.substr(1), options_);
 #else
     EscapeStringToStream(out, str, options_);
 #endif
   }
 }