Fix listing of '' and '/'.

runtime/bin/directory_win.cc

Index: runtime/bin/directory_win.cc
diff --git a/runtime/bin/directory_win.cc b/runtime/bin/directory_win.cc
index 3733a71384e5d734f7d4b52d1694aba85875238f..54c99c1f4d1a4feddd896823a359010064f68c87 100644
--- a/runtime/bin/directory_win.cc
+++ b/runtime/bin/directory_win.cc
@@ -170,7 +170,7 @@ ListType DirectoryListingEntry::Next(DirectoryListing* listing) {
   WIN32_FIND_DATAW find_file_data;
 
   if (lister_ == 0) {
-    if (!listing->path_buffer().AddW(L"\\*")) {
+    if (!listing->path_buffer().AddW(L"*")) {
       done_ = true;
       return kListError;
     }
@@ -187,6 +187,12 @@ ListType DirectoryListingEntry::Next(DirectoryListing* listing) {
 
     lister_ = reinterpret_cast<intptr_t>(find_handle);
 
+    if (parent_ != NULL) {
+      if (!listing->path_buffer().AddW(L"\\")) {
+        return kListError;
+      }
+    }
+
     listing->path_buffer().Reset(path_length_);
 
     return HandleFindFile(listing, this, find_file_data);