UMA metrics added for HID detection dialog.

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index f55c4b1219a61eb9316f5cf7080f58fd2655486a..b8380e19224fba1d18e50e02c6af1ad1af3963c3 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -162,6 +162,7 @@
 #include "chrome/browser/chromeos/system/automatic_reboot_manager.h"
 #include "chrome/browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.h"
 #include "chrome/browser/ui/webui/chromeos/charger_replacement_handler.h"
+#include "chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/network_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 #else
@@ -291,6 +292,7 @@ void RegisterLocalState(PrefRegistrySimple* registry) {
   chromeos::KioskAppManager::RegisterPrefs(registry);
   chromeos::LoginUtils::RegisterPrefs(registry);
   chromeos::MultiProfileUserController::RegisterPrefs(registry);
+  chromeos::HIDDetectionScreenHandler::RegisterPrefs(registry);
   chromeos::NetworkScreenHandler::RegisterPrefs(registry);
   chromeos::Preferences::RegisterPrefs(registry);
   chromeos::proxy_config::RegisterPrefs(registry);