Some additions to support symlinks better on platforms that support them.

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 e0a1a55e066738e8f1d9025324a4825e58d96c05..e71051eca763f5c51890e10cb04a75d037c8d708 100644
--- a/base/file_util_posix.cc
+++ b/base/file_util_posix.cc
@@ -373,6 +373,29 @@ bool ReadFromFD(int fd, char* buffer, size_t bytes) {
   return total_read == bytes;
 }
 
+bool CreateSymbolicLink(const FilePath& target_path,
+                        const FilePath& symlink_path) {
+  DCHECK(!symlink_path.empty());
+  DCHECK(!target_path.empty());
+  return ::symlink(target_path.value().c_str(),
+                   symlink_path.value().c_str()) != -1;
+}
+
+bool ReadSymbolicLink(const FilePath& symlink_path,
+                      FilePath* target_path) {
+  DCHECK(!symlink_path.empty());
+  DCHECK(target_path);
+  char buf[PATH_MAX];
+  ssize_t count = ::readlink(symlink_path.value().c_str(), buf, arraysize(buf));
+
+  if (count <= 0)
+    return false;
+
+  *target_path = FilePath(FilePath::StringType(buf, count));
+
+  return true;
+}
+
 // Creates and opens a temporary file in |directory|, returning the
 // file descriptor. |path| is set to the temporary file path.
 // This function does NOT unlink() the file.