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..ea0f452490c7e6ddfa95f6fe1a954f7e9cd824e1 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -251,6 +251,11 @@ class ExistingUserController
   // auto-login timer is started.
   void PerformLoginFinishedActions(bool start_auto_login_timer);
 
+  // Invokes |continuation| after verifying that cryptohome service is available
+  void ContinueLoginWhenCryptohomeAvailable(
+      const base::OnceClosure continuation,

[xiyuan, 2017/04/18 16:38:00]

This could not be "const" since we would std::move() it, right? At least, it
should be consistent with cc file.

[Sergey Poromov, 2017/04/19 11:08:25]

Done.

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