[gin] Implement V8ForegroundTaskRunner::PostNonNestableDelayedTask

Needed for the Atomics.waitAsync API's timeout functionality

Bug: chromium:1167541
Change-Id: I713348641a7eeb74f924a8f3081cb746989b9bda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2691397
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#853445}

gin/v8_foreground_task_runner.cc

@@ -37,6 +37,14 @@ void V8ForegroundTaskRunner::PostDelayedTask(std::unique_ptr<v8::Task> task,
       base::TimeDelta::FromSecondsD(delay_in_seconds));
 }
 
+void V8ForegroundTaskRunner::PostNonNestableDelayedTask(
+    std::unique_ptr<v8::Task> task,
+    double delay_in_seconds) {
+  task_runner_->PostNonNestableDelayedTask(
+      FROM_HERE, base::BindOnce(&v8::Task::Run, std::move(task)),
+      base::TimeDelta::FromSecondsD(delay_in_seconds));
+}
+
 void V8ForegroundTaskRunner::PostIdleTask(std::unique_ptr<v8::IdleTask> task) {
   DCHECK(IdleTasksEnabled());
   idle_task_runner()->PostIdleTask(std::move(task));
@@ -46,4 +54,8 @@ bool V8ForegroundTaskRunner::NonNestableTasksEnabled() const {
   return true;
 }
 
+bool V8ForegroundTaskRunner::NonNestableDelayedTasksEnabled() const {
+  return true;
+}
+
 }  // namespace gin

gin/v8_foreground_task_runner.h

@@ -29,9 +29,13 @@ class V8ForegroundTaskRunner : public V8ForegroundTaskRunnerBase {
   void PostDelayedTask(std::unique_ptr<v8::Task> task,
                        double delay_in_seconds) override;
 
+  void PostNonNestableDelayedTask(std::unique_ptr<v8::Task> task,
+                                  double delay_in_seconds) override;
+
   void PostIdleTask(std::unique_ptr<v8::IdleTask> task) override;
 
   bool NonNestableTasksEnabled() const override;
+  bool NonNestableDelayedTasksEnabled() const override;
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;