Wait for Cryptohome service to be available on login.

chrome/browser/chromeos/login/existing_user_controller.h

Index: chrome/browser/chromeos/login/existing_user_controller.h
diff --git a/chrome/browser/chromeos/login/existing_user_controller.h b/chrome/browser/chromeos/login/existing_user_controller.h
index 32f8a497364c3e69c7bb2354b48da675ea897c42..81b3f7f8fdbe8d301554478cdd844a3e63736d1e 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -251,6 +251,10 @@ class ExistingUserController
   // auto-login timer is started.
   void PerformLoginFinishedActions(bool start_auto_login_timer);
 
+  // Invokes |continuation| after verifying that cryptohome service is available

[Roman Sorokin (ftl), 2017/04/19 11:26:02]

nit: dot at the end.

[Sergey Poromov, 2017/04/19 11:38:06]

Done.

+  void ContinueLoginWhenCryptohomeAvailable(base::OnceClosure continuation,
+                                            bool service_is_available);
+
   // Invokes |continuation| after verifying that the device is not disabled.
   void ContinueLoginIfDeviceNotDisabled(const base::Closure& continuation);