Add user data dir field to Mac platform apps

chrome/app/app_mode_loader_mac.mm

Index: chrome/app/app_mode_loader_mac.mm
diff --git a/chrome/app/app_mode_loader_mac.mm b/chrome/app/app_mode_loader_mac.mm
index 9a1a3917736856b1818ab82cfc97914f59a181e1..80dc8088a8c41446c57ba7d647548f17bd5d4425 100644
--- a/chrome/app/app_mode_loader_mac.mm
+++ b/chrome/app/app_mode_loader_mac.mm
@@ -95,6 +95,9 @@ void LoadFramework(void** cr_dylib, app_mode::ChromeAppModeInfo* info) {
       [info_plist objectForKey:app_mode::kCrAppModeShortcutURLKey]);
   CHECK(info->app_mode_url.size()) << "couldn't get app shortcut URL";
 
+  info->user_data_dir = base::mac::NSStringToFilePath(
+      [info_plist objectForKey:app_mode::kCrAppModeUserDataDirKey]);
+
   // Open the framework.
   *cr_dylib = dlopen(framework_shlib_path.value().c_str(), RTLD_LAZY);
   CHECK(cr_dylib) << "couldn't load framework: " << dlerror();