Move throttling of background timers into the renderer scheduler

components/scheduler/renderer/web_frame_scheduler_impl.cc

Index: components/scheduler/renderer/web_frame_scheduler_impl.cc
diff --git a/components/scheduler/renderer/web_frame_scheduler_impl.cc b/components/scheduler/renderer/web_frame_scheduler_impl.cc
index 15e4a7de89b1d0978b2909ce472ad7c1a10a98aa..af85feb2ae9bda5410517b2994526285d4e95c21 100644
--- a/components/scheduler/renderer/web_frame_scheduler_impl.cc
+++ b/components/scheduler/renderer/web_frame_scheduler_impl.cc
@@ -16,7 +16,8 @@ WebFrameSchedulerImpl::WebFrameSchedulerImpl(
     WebViewSchedulerImpl* parent_web_view_scheduler)
     : renderer_scheduler_(renderer_scheduler),
       parent_web_view_scheduler_(parent_web_view_scheduler),
-      visible_(true) {}
+      visible_(true),
+      page_in_background_(false) {}
 
 WebFrameSchedulerImpl::~WebFrameSchedulerImpl() {
   if (loading_task_queue_.get())
@@ -51,6 +52,9 @@ blink::WebTaskRunner* WebFrameSchedulerImpl::timerTaskRunner() {
   if (!timer_web_task_runner_) {
     timer_task_queue_ =
         renderer_scheduler_->NewTimerTaskRunner("frame_timer_tq");
+    timer_task_queue_->SetPumpPolicy(page_in_background_
+                                         ? TaskQueue::PumpPolicy::MANUAL
+                                         : TaskQueue::PumpPolicy::AUTO);
     timer_web_task_runner_.reset(new WebTaskRunnerImpl(timer_task_queue_));
   }
   return timer_web_task_runner_.get();
@@ -63,4 +67,26 @@ void WebFrameSchedulerImpl::setFrameOrigin(
   // TODO(skyostil): Associate the task queues with this origin.
 }
 
+void WebFrameSchedulerImpl::SetPageInBackground(bool page_in_background) {
+  if (page_in_background_ == page_in_background)
+    return;
+
+  page_in_background_ = page_in_background;
+
+  if (!timer_task_queue_)
+    return;
+
+  timer_task_queue_->SetPumpPolicy(page_in_background_
+                                       ? TaskQueue::PumpPolicy::MANUAL
+                                       : TaskQueue::PumpPolicy::AUTO);
+}
+
+void WebFrameSchedulerImpl::PumpBackgroundTasks() {
+  DCHECK(page_in_background_);
+  if (!timer_task_queue_)
+    return;
+
+  timer_task_queue_->PumpQueue();
+}
+
 }  // namespace scheduler