Pass "client_id" param to the enrollment frame.

chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc
index 0656a584edf2ca6ec429edfd4631c9d7e428cd8b..923c60aef75e0fe966af90b9bec996e54bd7d6a1 100644
--- a/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc
@@ -554,6 +554,8 @@ void EnrollmentScreenHandler::ShowErrorMessage(const std::string& message,
 void EnrollmentScreenHandler::DoShow() {
   base::DictionaryValue screen_data;
   screen_data.SetString("gaiaUrl", GaiaUrls::GetInstance()->gaia_url().spec());
+  screen_data.SetString("clientId",
+                        GaiaUrls::GetInstance()->oauth2_chrome_client_id());
   screen_data.SetString("enrollment_mode",
                         EnrollmentModeToUIMode(config_.mode));
   screen_data.SetString("management_domain", config_.management_domain);