arc: Provide UMA for OptIn flow.

chrome/browser/chromeos/arc/arc_session_manager.h

 // Copyright 2016 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_ARC_ARC_SESSION_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_SESSION_MANAGER_H_
 
 #include <memory>
 #include <ostream>
 #include <string>
@@ skipping 215 matching lines @@
 
   // Returns whether the Play Store app is requested to be launched by this
   // class. Should be used only for tests.
   bool IsPlaystoreLaunchRequestedForTesting() const;
 
   // Invoking StartArc() only for testing, e.g., to emulate accepting Terms of
   // Service then passing Android management check successfully.
   void StartArcForTesting() { StartArc(); }
 
  private:
+  // Reports statuses of OptIn flow to UMA.
+  class ScopedOptInFlowTracker;
+
   // RequestEnable() has a check in order not to trigger starting procedure
   // twice. This method can be called to bypass that check when restarting.
   void RequestEnableImpl();
 
   // Negotiates the terms of service to user, if necessary.
   // Otherwise, move to StartAndroidManagementCheck().
   void MaybeStartTermsOfServiceNegotiation();
   void OnTermsOfServiceNegotiated(bool accepted);
 
   // Returns true if Terms of Service negotiation is needed. Otherwise false.
@@ skipping 73 matching lines @@
   bool provisioning_reported_ = false;
   base::OneShotTimer arc_sign_in_timer_;
 
   std::unique_ptr<ArcSupportHost> support_host_;
 
   std::unique_ptr<ArcTermsOfServiceNegotiator> terms_of_service_negotiator_;
 
   std::unique_ptr<ArcAuthContext> context_;
   std::unique_ptr<ArcAndroidManagementChecker> android_management_checker_;
 
+  std::unique_ptr<ScopedOptInFlowTracker> scoped_opt_in_tracker_;
+
   // The time when the sign in process started.
   base::Time sign_in_start_time_;
   // The time when ARC was about to start.
   base::Time arc_start_time_;
   base::Closure attempt_user_exit_callback_;
 
   // Must be the last member.
   base::WeakPtrFactory<ArcSessionManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcSessionManager);
 };
 
 // Outputs the stringified |state| to |os|. This is only for logging purposes.
 std::ostream& operator<<(std::ostream& os,
                          const ArcSessionManager::State& state);
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_SESSION_MANAGER_H_