[Sync] Log age of auth tokens on authentication failure

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index aae5d418543d163dea1cac4019d80a3c2658a571..931f2790e5afedfdff8d830df0f4126494ef63e7 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -598,11 +598,14 @@ void SyncManagerImpl::UpdateCredentials(const SyncCredentials& credentials) {
   DCHECK(!credentials.sync_token.empty());
 
   observing_network_connectivity_changes_ = true;
-  if (!connection_manager_->set_auth_token(credentials.sync_token))
+  if (!connection_manager_->SetAuthToken(credentials.sync_token,
+                                         credentials.sync_token_time))
     return;  // Auth token is known to be invalid, so exit early.
 
   invalidator_->UpdateCredentials(credentials.email, credentials.sync_token);
   scheduler_->OnCredentialsUpdated();
+
+  // TODO(zea): pass the credential age to the debug info event listener.
 }
 
 void SyncManagerImpl::UpdateEnabledTypes(ModelTypeSet enabled_types) {