Track whether a given user session has completed initialization, and use

components/user_manager/known_user.cc

Index: components/user_manager/known_user.cc
diff --git a/components/user_manager/known_user.cc b/components/user_manager/known_user.cc
index 815d105e187f75d648fc1543cf7d0e0a184a6a7d..f5dfd8ade1575e372eda998ceea278d1c2cf8a5e 100644
--- a/components/user_manager/known_user.cc
+++ b/components/user_manager/known_user.cc
@@ -53,6 +53,9 @@ const char kReauthReasonKey[] = "reauth_reason";
 // Key for the GaiaId migration status.
 const char kGaiaIdMigration[] = "gaia_id_migration";
 
+// Key of the boolean flag telling if user session has finished init yet.
+const char kProfileEverInitialized[] = "profile_ever_initialized";
+
 PrefService* GetLocalState() {
   if (!UserManager::IsInitialized())
     return nullptr;
@@ -451,6 +454,22 @@ bool IsUsingSAML(const AccountId& account_id) {
   return false;
 }
 
+bool WasProfileEverInitialized(const AccountId& account_id) {
+  bool profile_ever_initialized;
+  if (GetBooleanPref(account_id, kProfileEverInitialized,
+                     &profile_ever_initialized))
+    return profile_ever_initialized;
+
+  // Sessions created before we started setting the session_initialized flag
+  // should default to "initialized = true".
+  LOG(WARNING) << "Treating unmigrated user as profile_ever_initialized=true";
+  return true;
+}
+
+void SetProfileEverInitialized(const AccountId& account_id, bool initialized) {
+  SetBooleanPref(account_id, kProfileEverInitialized, initialized);
+}
+
 void UpdateReauthReason(const AccountId& account_id, const int reauth_reason) {
   SetIntegerPref(account_id, kReauthReasonKey, reauth_reason);
 }