scheduler: Make virtual time expiration deterministic

third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.cc

Index: third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.cc
index 36fb95f9c0855dd395796582acb2fb2a6db685a6..bba2063de41328bffea931211893b0df02f07aeb 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.cc
@@ -100,6 +100,8 @@ WebViewSchedulerImpl::WebViewSchedulerImpl(
     : intervention_reporter_(intervention_reporter),
       renderer_scheduler_(renderer_scheduler),
       virtual_time_policy_(VirtualTimePolicy::ADVANCE),
+      control_task_runner_(
+          WebTaskRunnerImpl::Create(renderer_scheduler->ControlTaskQueue())),
       background_parser_count_(0),
       page_visible_(true),
       should_throttle_frames_(false),
@@ -260,6 +262,15 @@ void WebViewSchedulerImpl::SetVirtualTimePolicy(VirtualTimePolicy policy) {
   }
 }
 
+void WebViewSchedulerImpl::GrantVirtualTimeBudget(
+    base::TimeDelta budget,
+    std::unique_ptr<WTF::Closure> budget_exhausted_callback) {
+  virtual_time_budget_expired_task_handle_ =
+      control_task_runner_->PostDelayedCancellableTask(
+          BLINK_FROM_HERE, std::move(budget_exhausted_callback),
+          budget.InMilliseconds());
+}
+
 void WebViewSchedulerImpl::AudioStateChanged(bool is_audio_playing) {
   is_audio_playing_ = is_audio_playing;
   renderer_scheduler_->OnAudioStateChanged();