Add symbolic link support to FileSystemFileUtil::AbstractFileEnumerator.

base/file_util_posix.cc

Index: base/file_util_posix.cc
diff --git a/base/file_util_posix.cc b/base/file_util_posix.cc
index 58cd732a7b4f762b8751dc71321682b962bcd0d9..16cf629c0434435e6fa9250115b539e226d2ecc5 100644
--- a/base/file_util_posix.cc
+++ b/base/file_util_posix.cc
@@ -774,11 +774,17 @@ void FileEnumerator::GetFindInfo(FindInfo* info) {
   info->filename.assign(cur_entry->filename.value());
 }
 
+// static
 bool FileEnumerator::IsDirectory(const FindInfo& info) {
   return S_ISDIR(info.stat.st_mode);
 }
 
 // static
+bool FileEnumerator::IsLink(const FindInfo& info) {
+  return S_ISLNK(info.stat.st_mode);
+}
+
+// static
 FilePath FileEnumerator::GetFilename(const FindInfo& find_info) {
   return FilePath(find_info.filename);
 }