Run load state update timer only when needed

content/browser/loader/resource_scheduler.cc

Index: content/browser/loader/resource_scheduler.cc
diff --git a/content/browser/loader/resource_scheduler.cc b/content/browser/loader/resource_scheduler.cc
index a3d3d649ac2dc1c51bc20774fc6f637c68759b99..7bc6c0458b86648b22e88ed16bd5cfceea8c52e6 100644
--- a/content/browser/loader/resource_scheduler.cc
+++ b/content/browser/loader/resource_scheduler.cc
@@ -1005,6 +1005,14 @@ bool ResourceScheduler::IsClientVisibleForTesting(int child_id, int route_id) {
   return client->is_visible();
 }
 
+bool ResourceScheduler::HasLoadingClients() const {
+  for (const auto& client : client_map_) {
+    if (!client.second->is_loaded())
+      return true;
+  }
+  return false;
+}
+
 ResourceScheduler::Client* ResourceScheduler::GetClient(int child_id,
                                                         int route_id) {
   ClientId client_id = MakeClientId(child_id, route_id);