Add a signal to the scheduler that a navigation is expected

components/scheduler/renderer/renderer_web_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/renderer_web_scheduler_impl.h"
 
 #include "components/scheduler/child/task_queue.h"
 #include "components/scheduler/renderer/renderer_scheduler.h"
 #include "components/scheduler/renderer/web_frame_host_scheduler_impl.h"
 
@@ skipping 17 matching lines @@
 
 void RendererWebSchedulerImpl::resumeTimerQueue() {
   renderer_scheduler_->ResumeTimerQueue();
 }
 
 blink::WebFrameHostScheduler*
 RendererWebSchedulerImpl::createFrameHostScheduler() {
   return new WebFrameHostSchedulerImpl(renderer_scheduler_);
 }
 
+void RendererWebSchedulerImpl::addPendingNavigation() {
+  renderer_scheduler_->AddPendingNavigation();
+}
+
+void RendererWebSchedulerImpl::removePendingNavigation() {
+  renderer_scheduler_->RemovePendingNavigation();
+}
+
+void RendererWebSchedulerImpl::onNavigationStarted() {
+  renderer_scheduler_->OnNavigationStarted();
+}
+
 }  // namespace scheduler