diff --git a/common/settings.h b/common/settings.h
index b857b4aade6a2e0c08943e72576140bc0a731ef9..e58a3d0aef90f3edee95072e5bc66d396f0658b4 100644
--- a/common/settings.h
+++ b/common/settings.h
@@ -79,7 +79,7 @@ struct Settings {
   // tasks suitable when idling. Due to this, embedders are still advised to be
   // as fast as possible in returning from this callback. Long running
   // operations in this callback do have the capability of introducing jank.
-  fml::closure idle_notification_callback;
+  std::function<void(int64_t)> idle_notification_callback;
   bool enable_software_rendering = false;
   bool skia_deterministic_rendering_on_cpu = false;
   bool verbose_logging = false;
diff --git a/runtime/runtime_controller.cc b/runtime/runtime_controller.cc
index e4c3c3289e0060d66e13fe9a1b3b24843851c433..5176101f4a2a3200086f60f458c56a30fe85e50f 100644
--- a/runtime/runtime_controller.cc
+++ b/runtime/runtime_controller.cc
@@ -25,7 +25,7 @@ RuntimeController::RuntimeController(
     fml::RefPtr<flow::SkiaUnrefQueue> p_unref_queue,
     std::string p_advisory_script_uri,
     std::string p_advisory_script_entrypoint,
-    fml::closure p_idle_notification_callback)
+    std::function<void(int64_t)> p_idle_notification_callback)
     : RuntimeController(p_client,
                         p_vm,
                         std::move(p_isolate_snapshot),
@@ -50,7 +50,7 @@ RuntimeController::RuntimeController(
     fml::RefPtr<flow::SkiaUnrefQueue> p_unref_queue,
     std::string p_advisory_script_uri,
     std::string p_advisory_script_entrypoint,
-    fml::closure idle_notification_callback,
+    std::function<void(int64_t)> idle_notification_callback,
     WindowData p_window_data)
     : client_(p_client),
       vm_(p_vm),
@@ -212,7 +212,7 @@ bool RuntimeController::NotifyIdle(int64_t deadline) {
   // Idle notifications being in isolate scope are part of the contract.
   if (idle_notification_callback_) {
     TRACE_EVENT0("flutter", "EmbedderIdleNotification");
-    idle_notification_callback_();
+    idle_notification_callback_(deadline);
   }
   return true;
 }
diff --git a/runtime/runtime_controller.h b/runtime/runtime_controller.h
index 5bbb47e221e776a9f1562ef521427a883495039d..0aacc8289043f0b757fa1b0b556996c19ebc498d 100644
--- a/runtime/runtime_controller.h
+++ b/runtime/runtime_controller.h
@@ -37,7 +37,7 @@ class RuntimeController final : public WindowClient {
                     fml::RefPtr<flow::SkiaUnrefQueue> unref_queue,
                     std::string advisory_script_uri,
                     std::string advisory_script_entrypoint,
-                    fml::closure idle_notification_callback);
+                    std::function<void(int64_t)> idle_notification_callback);
 
   ~RuntimeController() override;
 
@@ -126,7 +126,7 @@ class RuntimeController final : public WindowClient {
   fml::RefPtr<flow::SkiaUnrefQueue> unref_queue_;
   std::string advisory_script_uri_;
   std::string advisory_script_entrypoint_;
-  fml::closure idle_notification_callback_;
+  std::function<void(int64_t)> idle_notification_callback_;
   WindowData window_data_;
   std::weak_ptr<DartIsolate> root_isolate_;
   std::pair<bool, uint32_t> root_isolate_return_code_ = {false, 0};
@@ -141,7 +141,7 @@ class RuntimeController final : public WindowClient {
                     fml::RefPtr<flow::SkiaUnrefQueue> unref_queue,
                     std::string advisory_script_uri,
                     std::string advisory_script_entrypoint,
-                    fml::closure idle_notification_callback,
+                    std::function<void(int64_t)> idle_notification_callback,
                     WindowData data);
 
   Window* GetWindowIfAvailable();