Add a signal to the scheduler that a navigation is expected

content/test/fake_renderer_scheduler.cc

Index: content/test/fake_renderer_scheduler.cc
diff --git a/content/test/fake_renderer_scheduler.cc b/content/test/fake_renderer_scheduler.cc
index fd05d4b692328f14840379116af8b8a9281b144d..0c5a48c7516bee10d3d80608edc4c2bfe2e8c63d 100644
--- a/content/test/fake_renderer_scheduler.cc
+++ b/content/test/fake_renderer_scheduler.cc
@@ -82,7 +82,13 @@ void FakeRendererScheduler::OnRendererBackgrounded() {
 void FakeRendererScheduler::OnRendererForegrounded() {
 }
 
-void FakeRendererScheduler::OnPageLoadStarted() {
+void FakeRendererScheduler::NavigationTaskPendingIncRef() {
+}
+
+void FakeRendererScheduler::NavigationTaskPendingDecRef() {
+}
+
+void FakeRendererScheduler::OnNavigationStarted() {
 }
 
 bool FakeRendererScheduler::ShouldYieldForHighPriorityWork() {