Add flag to track migration from email to gaia id.

BUG=341408

Review URL: https://codereview.chromium.org/475763005

Cr-Commit-Position: refs/heads/master@{#291737}

chrome/browser/signin/account_tracker_service_factory.cc

@@ -11,6 +11,7 @@
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
+#include "components/signin/core/common/signin_pref_names.h"
 
 AccountTrackerServiceFactory::AccountTrackerServiceFactory()
     : BrowserContextKeyedServiceFactory(
@@ -39,6 +40,10 @@ void AccountTrackerServiceFactory::RegisterProfilePrefs(
   registry->RegisterListPref(
       AccountTrackerService::kAccountInfoPref,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+  registry->RegisterIntegerPref(
+      prefs::kAccountIdMigrationState,
+      AccountTrackerService::MIGRATION_NOT_STARTED,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 KeyedService* AccountTrackerServiceFactory::BuildServiceInstanceFor(

components/signin/core/browser/account_tracker_service.cc

@@ -9,6 +9,7 @@
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/signin/core/browser/signin_manager.h"
+#include "components/signin/core/common/signin_pref_names.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 #include "google_apis/gaia/gaia_constants.h"
 #include "google_apis/gaia/gaia_oauth_client.h"
@@ -242,6 +243,18 @@ AccountTrackerService::FindAccountInfoByEmail(
   return AccountInfo();
 }
 
+AccountTrackerService::AccountIdMigrationState
+AccountTrackerService::GetMigrationState() {
+  return GetMigrationState(pref_service_);
+}
+
+// static
+AccountTrackerService::AccountIdMigrationState
+AccountTrackerService::GetMigrationState(PrefService* pref_service) {
+  return static_cast<AccountTrackerService::AccountIdMigrationState>(
+      pref_service->GetInteger(prefs::kAccountIdMigrationState));
+}
+
 void AccountTrackerService::OnRefreshTokenAvailable(
     const std::string& account_id) {
   TRACE_EVENT1("AccountTrackerService",

components/signin/core/browser/account_tracker_service.h

@@ -48,6 +48,13 @@ class AccountTrackerService : public KeyedService,
     virtual void OnAccountRemoved(const AccountInfo& info) = 0;
   };
 
+  // Possible values for the kAccountIdMigrationState preference.
+  enum AccountIdMigrationState {
+    MIGRATION_NOT_STARTED,
+    MIGRATION_IN_PROGRESS,
+    MIGRATION_DONE
+  };
+
   AccountTrackerService();
   virtual ~AccountTrackerService();
 
@@ -72,6 +79,9 @@ class AccountTrackerService : public KeyedService,
   // there are still unfininshed fetchers.
   virtual bool IsAllUserInfoFetched() const;
 
+  AccountIdMigrationState GetMigrationState();
+  static AccountIdMigrationState GetMigrationState(PrefService* pref_service);
+
  private:
   friend class AccountInfoFetcher;
 

components/signin/core/common/signin_pref_names.cc

@@ -6,6 +6,11 @@
 
 namespace prefs {
 
+// An integer property indicating the state of account id migration from
+// email to gaia id for the the profile.  See account_tracker_service.h
+// for possible values.
+const char kAccountIdMigrationState[] = "account_id_migration_state";
+
 // Boolean identifying whether reverse auto-login is enabled.
 const char kAutologinEnabled[] = "autologin.enabled";
 

components/signin/core/common/signin_pref_names.h

@@ -7,6 +7,7 @@
 
 namespace prefs {
 
+extern const char kAccountIdMigrationState[];
 extern const char kAutologinEnabled[];
 extern const char kGoogleServicesLastUsername[];
 extern const char kGoogleServicesUserAccountId[];