Restart Chrome on ChromeOS as early as possible to speed up restart.

chrome/browser/chromeos/login/login_utils.h

Index: chrome/browser/chromeos/login/login_utils.h
diff --git a/chrome/browser/chromeos/login/login_utils.h b/chrome/browser/chromeos/login/login_utils.h
index a28e49cec3f21007a158a1a3d9853645f0f7842b..9702437484c0e25b445c3b93d3a32dbf8a2d970e 100644
--- a/chrome/browser/chromeos/login/login_utils.h
+++ b/chrome/browser/chromeos/login/login_utils.h
@@ -89,6 +89,15 @@ class LoginUtils {
   // TODO(nkostylev): Cleanup after WebUI login migration is complete.
   virtual scoped_refptr<Authenticator> CreateAuthenticator(
       LoginStatusConsumer* consumer) = 0;
+
+  // Initiates process restart if needed.
+  // |early_restart| is true if this restart attempt happens before user profile
+  // is fully initialized.
+  // Might not return if restart is possible right now.
+  // Returns true if restart was scheduled.
+  // Returns false if no restart is needed,
+  virtual bool RestartToApplyPerSessionFlagsIfNeed(Profile* profile,
+                                                   bool early_restart) = 0;
 };
 
 }  // namespace chromeos