Hook up symbol files to the Windows GN build.

tools/gn/path_output.cc

Index: tools/gn/path_output.cc
diff --git a/tools/gn/path_output.cc b/tools/gn/path_output.cc
index 7e739b6edc433d03268d6f1fb8accab3d891ac3a..21140d7f86e75fa47be9dc28b9a3b1e0cbcdf2c8 100644
--- a/tools/gn/path_output.cc
+++ b/tools/gn/path_output.cc
@@ -75,6 +75,29 @@ void PathOutput::WriteFile(std::ostream& out, const OutputFile& file) const {
   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.