[content]: Add CanExceedIdleDeadlineIfRequired function to RendererScheduler.

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 5deb2880c2fb10388aa42a5c39e0143acb3280bf..e746c60d6101549ec947a548f344e541990429d8 100644
--- a/content/test/fake_renderer_scheduler.cc
+++ b/content/test/fake_renderer_scheduler.cc
@@ -56,6 +56,10 @@ bool FakeRendererScheduler::ShouldYieldForHighPriorityWork() {
   return false;
 }
 
+bool FakeRendererScheduler::CanExceedIdleDeadlineIfRequired() const {
+  return false;
+}
+
 void FakeRendererScheduler::AddTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
 }