Add OS_CHROMEOS case in file_util::GetHomeDir()

base/chromeos/chromeos_version.cc

 // Copyright (c) 2012 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 "base/chromeos/chromeos_version.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "base/logging.h"
 
 namespace base {
 namespace chromeos {
 
 bool IsRunningOnChromeOS() {
   // Check if the user name is chronos. Note that we don't go with
   // getuid() + getpwuid_r() as it may end up reading /etc/passwd, which
   // can be expensive.
   const char* user = getenv("USER");
   return user && strcmp(user, "chronos") == 0;
 }
 
+std::string GetHomeDirectory() {
+  if (IsRunningOnChromeOS())
+    return "/home/chronos/user";
+
+  const char* home = getenv("HOME");
+  if (home)
+    return home;
+  return "";
+}
+
 }  // namespace chromeos
 }  // namespace base