Add user data dir field to Mac platform apps

chrome/app/chrome_main_app_mode_mac.mm

Index: chrome/app/chrome_main_app_mode_mac.mm
diff --git a/chrome/app/chrome_main_app_mode_mac.mm b/chrome/app/chrome_main_app_mode_mac.mm
index 46134e915f53a28577274ab5b4e12830d3ab4ffd..b2c78244908cdbe440061cd9653a76ebb6da875d 100644
--- a/chrome/app/chrome_main_app_mode_mac.mm
+++ b/chrome/app/chrome_main_app_mode_mac.mm
@@ -45,10 +45,10 @@ int ChromeAppModeStart(const app_mode::ChromeAppModeInfo* info) {
   // TODO(viettrungluu): do something intelligent with data
   //  return ChromeMain(info->argc, info->argv);
   // For now, a cheesy hack instead.
-  RAW_CHECK(info->app_mode_url.size());
-  std::string argv1(std::string("--app=") + info->app_mode_url);
   RAW_CHECK(info->app_mode_id.size());
-  std::string argv2(std::string("--user-data-dir=/tmp/") + info->app_mode_id);
+  std::string argv1(std::string("--app-id=") + info->app_mode_id);
+  std::string argv2(
+      std::string("--user-data-dir=") + info->user_data_dir.value());
   char* argv[] = { info->argv[0],
                    const_cast<char*>(argv1.c_str()),
                    const_cast<char*>(argv2.c_str()) };