Activate the VariationsService for ChromeOS and ensure that it does not ping the server until the E…

chrome/common/chrome_notification_types.h

Index: chrome/common/chrome_notification_types.h
diff --git a/chrome/common/chrome_notification_types.h b/chrome/common/chrome_notification_types.h
index 9cdccc866e7eebc4e045618914c24ea2822c1a9a..086856b7976e889bea0a95a7476bc243aadafedd 100644
--- a/chrome/common/chrome_notification_types.h
+++ b/chrome/common/chrome_notification_types.h
@@ -1022,6 +1022,10 @@ enum NotificationType {
   // First paint event after this fires NOTIFICATION_LOGIN_WEBUI_VISIBLE.
   NOTIFICATION_WIZARD_FIRST_SCREEN_SHOWN,
 
+  // Sent when the EULA has been accepted in the first-run wizard. This is never
+  // sent if the EULA was already accepted at startup.
+  NOTIFICATION_WIZARD_EULA_ACCEPTED,
+
   // Sent when the specific part of login WebUI is considered to be visible.
   // That moment is tracked as the first paint event after one of the:
   // 1. NOTIFICATION_LOGIN_USER_IMAGES_LOADED