[Bootstrapping] Introduce an accelerator to put a ChromeOS device into Slave OOBE process.

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

Index: chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
index f53ba6d38a29cd223c89eebaec951eb800af9d5b..e3dc2add7d7c27e7e20575e76e1553923eb26d87 100644
--- a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
@@ -28,11 +28,13 @@
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_constants.h"
+#include "chrome/common/pref_names.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
 #include "chromeos/chromeos_constants.h"
 #include "components/login/base_screen_handler_utils.h"
 #include "components/login/localized_values_builder.h"
+#include "components/prefs/pref_service.h"
 #include "components/strings/grit/components_strings.h"
 #include "components/version_info/version_info.h"
 #include "google_apis/google_api_keys.h"
@@ -159,6 +161,8 @@ void CoreOobeHandler::RegisterMessages() {
   AddCallback("headerBarVisible",
               &CoreOobeHandler::HandleHeaderBarVisible);
   AddCallback("raiseTabKeyEvent", &CoreOobeHandler::HandleRaiseTabKeyEvent);
+  AddCallback("setOobeBootstrappingSlave",
+              &CoreOobeHandler::HandleSetOobeBootstrappingSlave);
 }
 
 template <typename... Args>
@@ -496,6 +500,16 @@ void CoreOobeHandler::HandleRaiseTabKeyEvent(bool reverse) {
   SendEventToProcessor(&event);
 }
 
+void CoreOobeHandler::HandleSetOobeBootstrappingSlave() {
+  const bool is_slave = g_browser_process->local_state()->GetBoolean(
+      prefs::kIsBootstrappingSlave);
+  if (is_slave)
+    return;
+  g_browser_process->local_state()->SetBoolean(prefs::kIsBootstrappingSlave,
+                                               true);
+  chrome::AttemptRestart();
+}
+
 void CoreOobeHandler::InitDemoModeDetection() {
   demo_mode_detector_.InitDetection();
 }