Cross Device Promo - Main Eligibility Flow

chrome/browser/signin/cross_device_promo.h

Index: chrome/browser/signin/cross_device_promo.h
diff --git a/chrome/browser/signin/cross_device_promo.h b/chrome/browser/signin/cross_device_promo.h
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+// Copyright 2015 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_SIGNIN_CROSS_DEVICE_PROMO_H_
+#define CHROME_BROWSER_SIGNIN_CROSS_DEVICE_PROMO_H_
+
+#include "base/observer_list.h"
+#include "base/timer/timer.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "components/signin/core/browser/device_activity_fetcher.h"
+#include "components/signin/core/browser/gaia_cookie_manager_service.h"
+
+class PrefService;
+class SigninClient;
+class SigninManager;
+
+// This defines whether the cross device signin promo should be displayed for
+// this profile, and owns whether the user has opted out of the promo. The promo
+// targets those who sign into Chrome on other devices, who are not signed in
+// locally but use only one account in the content area.
+class CrossDevicePromo : public KeyedService,
+                         public GaiaCookieManagerService::Observer,
+                         public DeviceActivityFetcher::Observer {
+ public:
+  class Observer {
+   public:
+    // Called if the state changes.
+    virtual void OnPromoActivationChanged(bool active) = 0;
+  };
+
+  // Constructor accepts weak pointers to required services.
+  explicit CrossDevicePromo(SigninManager* signin_manager,
+                            GaiaCookieManagerService* cookie_manager_service,
+                            SigninClient* signin_client,
+                            PrefService* pref_service);
+  ~CrossDevicePromo() override;
+
+  // KeyedService:
+  void Shutdown() override;
+
+  void AddObserver(CrossDevicePromo::Observer* observer);
+  void RemoveObserver(CrossDevicePromo::Observer* observer);
+
+  // GaiaCookieManagerService::Observer:
+  void OnGaiaAccountsInCookieUpdated(
+      const std::vector<std::pair<std::string, bool>>& accounts,
+      const GoogleServiceAuthError& error) override;
+
+  // DeviceActivityFetcher::Observer:
+  void OnFetchDeviceActivitySuccess(
+      const std::vector<DeviceActivityFetcher::DeviceActivity>& devices)
+      override;
+  void OnFetchDeviceActivityFailure() override;
+
+  // Profile should be shown the promo.
+  bool IsPromoActive();
+
+  // User elects to opt out of this promo.
+  void OptOut();
+
+  // Called whenever the Last Active Time changes. This is used to determine
+  // when a new browsing session occurs.
+  void MaybeBrowsingSessionStarted(const base::Time& previous_last_active);
+
+  // Call this only in tests, please!
+  bool CheckPromoEligibilityForTesting() { return CheckPromoEligibility(); }
+
+ private:
+  // Load configuration parameters from the Variations Seed.
+  void Init();
+
+  // Set whether the promo is active or inactive.
+  void MarkPromoActive();
+  void MarkPromoInactive();
+
+  // Perform checks if the promo should be displayed to this profile.
+  bool CheckPromoEligibility();
+
+  // Helper to get the time value stored in a pref.
+  base::Time GetTimePref(const std::string& pref);
+
+  // Perform checks if the promo should be displayed to this profile. This will
+  // not write any prefs or initiate any checks that are otherwise called in
+  // CheckPromoEligibility. Records no metrics. Used for DCHECKs.
+  bool VerifyPromoEligibleReadOnly();
+
+  // Track that there is exactly one account in the cookie jar for a period
+  // of time in order to activate the promo.
+  void RegisterForCookieChanges();
+  void UnregisterForCookieChanges();
+
+  // Begin authenticating and then fetching the devices with the same account.
+  void GetDevicesActivityForAccountInCookie();
+
+  // Has the service been initialized. If false, the promo is inactive.
+  bool initialized_;
+
+  // ProfileKeyedServices and the PrefService are weak pointers.
+  SigninManager* signin_manager_;
+  GaiaCookieManagerService* cookie_manager_service_;
+  PrefService* prefs_;
+  SigninClient* signin_client_;
+
+  scoped_ptr<DeviceActivityFetcher> device_activity_fetcher_;
+  ObserverList<CrossDevicePromo::Observer> observer_list_;
+
+  // Maximum time since activity seen on another device that activity is
+  // considered within a context switch.
+  base::TimeDelta context_switch_duration_;
+
+  // Max time until the next Device Activity check. For the first test, this
+  // will be a uniformly random time between now and the max delay specified
+  // from Variations; otherwise we use the max delay as read from variations.
+  base::TimeDelta delay_until_next_list_devices_;
+
+  // Minimum time a single account must be in the cookie jar to consider the
+  // machine as used by only one person.
+  base::TimeDelta single_account_duration_threshold_;
+
+  // Time between noted browsing activity to determine when a new Browsing
+  // Session has started.
+  base::TimeDelta inactivity_between_browsing_sessions_;
+
+  // Throttles some portion of RPCs so they never get executed, based on the
+  // variations configuration.
+  bool is_throttled_;
+
+  // Metric to help us track how long a browsing session is. Useful for
+  // configurigng the promo.
+  base::Time start_last_browsing_session_;
+
+  // Used to delay the check of Device Activity.
+  base::OneShotTimer<CrossDevicePromo> device_activity_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrossDevicePromo);
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_CROSS_DEVICE_PROMO_H_