Added retry policy

chrome/browser/chromeos/login/enrollment/enrollment_screen.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_ENROLLMENT_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_ENROLLMENT_SCREEN_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/timer/timer.h"
 #include "chrome/browser/chromeos/login/enrollment/enrollment_screen_actor.h"
 #include "chrome/browser/chromeos/login/enrollment/enterprise_enrollment_helper.h"
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
 #include "chrome/browser/chromeos/policy/enrollment_config.h"
 #include "components/policy/core/common/cloud/cloud_policy_constants.h"
 #include "components/policy/core/common/cloud/enterprise_metrics.h"
+#include "net/base/backoff_entry.h"
 
 namespace base {
 class ElapsedTimer;
 }
 
 namespace pairing_chromeos {
 class ControllerPairingController;
 }
 
 namespace chromeos {
@@ skipping 107 matching lines @@
   // Shows the device attribute prompt screen.
   // Used as a callback to run after successful enrollment.
   void ShowAttributePromptScreen();
 
   // Record metrics when we encounter an enrollment error.
   void RecordEnrollmentErrorMetrics();
 
   // Advance to the next authentication mechanism if possible.
   bool AdvanceToNextAuth();
 
+  // Similar to OnRetry(), but responds to a timer instead of the user
+  // pressing the Retry button.
+  void AutomaticRetry();
+
+  // Processes a request to retry enrollment.
+  // Called by OnRetry() and AutomaticRetry().
+  void ProcessRetry();
+
   pairing_chromeos::ControllerPairingController* shark_controller_ = nullptr;
 
   EnrollmentScreenActor* actor_;
   policy::EnrollmentConfig config_;
   policy::EnrollmentConfig enrollment_config_;
   Auth current_auth_ = AUTH_OAUTH;
   Auth last_auth_ = AUTH_OAUTH;
   bool enrollment_failed_once_ = false;
   std::string enrolling_user_domain_;
   std::string auth_code_;
   std::unique_ptr<base::ElapsedTimer> elapsed_timer_;
+  base::OneShotTimer retry_timer_;

[The one and only Dr. Crash, 2016/12/06 22:24:33]

Instead of using a timer, you can simply post delayed tasks to your message
loop. See this CL as an example: https://codereview.chromium.org/2529743002/

+  net::BackoffEntry::Policy retry_policy_;
+  net::BackoffEntry retry_backoff_;
+  int num_retries_;
   std::unique_ptr<EnterpriseEnrollmentHelper> enrollment_helper_;
   base::WeakPtrFactory<EnrollmentScreen> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EnrollmentScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_ENROLLMENT_SCREEN_H_