Revert of Move throttling of background timers into the renderer scheduler

components/scheduler/renderer/web_frame_scheduler_impl.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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"
 #include "third_party/WebKit/public/platform/WebString.h"
 
 namespace scheduler {
 
 WebFrameSchedulerImpl::WebFrameSchedulerImpl(
     RendererSchedulerImpl* renderer_scheduler,
     WebViewSchedulerImpl* parent_web_view_scheduler)
     : renderer_scheduler_(renderer_scheduler),
       parent_web_view_scheduler_(parent_web_view_scheduler),
-      visible_(true),
-      page_in_background_(false) {}
+      visible_(true) {}
 
 WebFrameSchedulerImpl::~WebFrameSchedulerImpl() {
   if (loading_task_queue_.get())
     loading_task_queue_->UnregisterTaskQueue();
 
-  if (timer_task_queue_.get()) {
-    renderer_scheduler_->throttling_helper()->Unthrottle(
-        timer_task_queue_.get());
+  if (timer_task_queue_.get())
     timer_task_queue_->UnregisterTaskQueue();
-  }
 
   if (parent_web_view_scheduler_)
     parent_web_view_scheduler_->Unregister(this);
 }
 
 void WebFrameSchedulerImpl::DetachFromWebViewScheduler() {
   parent_web_view_scheduler_ = nullptr;
 }
 
 void WebFrameSchedulerImpl::setFrameVisible(bool visible) {
   visible_ = visible;
   // TODO(alexclarke): Do something with this flag.
 }
 
 blink::WebTaskRunner* WebFrameSchedulerImpl::loadingTaskRunner() {
   if (!loading_web_task_runner_) {
     loading_task_queue_ =
         renderer_scheduler_->NewLoadingTaskRunner("frame_loading_tq");
     loading_web_task_runner_.reset(new WebTaskRunnerImpl(loading_task_queue_));
   }
   return loading_web_task_runner_.get();
 }
 
 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();
 }
 
 void WebFrameSchedulerImpl::setFrameOrigin(
     const blink::WebSecurityOrigin* origin) {
   DCHECK(origin);
   origin_ = *origin;
   // 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