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..b8c1c1a6f176c55b9949e76aaf1d82f89bb1ba06 100644
--- a/components/scheduler/renderer/web_frame_scheduler_impl.cc
+++ b/components/scheduler/renderer/web_frame_scheduler_impl.cc
@@ -4,6 +4,8 @@
 
 #include "components/scheduler/renderer/web_frame_scheduler_impl.h"
 
+#include "components/scheduler/base/real_time_domain.h"
+#include "components/scheduler/base/virtual_time_domain.h"
 #include "components/scheduler/child/web_task_runner_impl.h"
 #include "components/scheduler/renderer/renderer_scheduler_impl.h"
 #include "components/scheduler/renderer/web_view_scheduler_impl.h"
@@ -16,14 +18,18 @@ 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())
     loading_task_queue_->UnregisterTaskQueue();
 
-  if (timer_task_queue_.get())
+  if (timer_task_queue_.get()) {
+    renderer_scheduler_->throttling_helper()->Unthrottle(
+        timer_task_queue_.get());
     timer_task_queue_->UnregisterTaskQueue();
+  }
 
   if (parent_web_view_scheduler_)
     parent_web_view_scheduler_->Unregister(this);
@@ -51,6 +57,10 @@ blink::WebTaskRunner* WebFrameSchedulerImpl::timerTaskRunner() {
   if (!timer_web_task_runner_) {
     timer_task_queue_ =
         renderer_scheduler_->NewTimerTaskRunner("frame_timer_tq");
+    if (page_in_background_) {
+      renderer_scheduler_->throttling_helper()->Throttle(
+          timer_task_queue_.get());
+    }
     timer_web_task_runner_.reset(new WebTaskRunnerImpl(timer_task_queue_));
   }
   return timer_web_task_runner_.get();
@@ -63,4 +73,21 @@ 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_web_task_runner_)
+    return;
+
+  if (page_in_background_) {
+    renderer_scheduler_->throttling_helper()->Throttle(timer_task_queue_.get());
+  } else {
+    renderer_scheduler_->throttling_helper()->Unthrottle(
+        timer_task_queue_.get());
+  }
+}
+
 }  // namespace scheduler