[content]: Add CanExceedIdleDeadlineIfRequired function to RendererScheduler.

content/renderer/scheduler/null_renderer_scheduler.cc

Index: content/renderer/scheduler/null_renderer_scheduler.cc
diff --git a/content/renderer/scheduler/null_renderer_scheduler.cc b/content/renderer/scheduler/null_renderer_scheduler.cc
index 7e5d2dbbe3c05a4caf12f301fe4c09b16b8d6eeb..67003596f2bd9781d3347841c733507561ca9053 100644
--- a/content/renderer/scheduler/null_renderer_scheduler.cc
+++ b/content/renderer/scheduler/null_renderer_scheduler.cc
@@ -89,6 +89,10 @@ bool NullRendererScheduler::ShouldYieldForHighPriorityWork() {
   return false;
 }
 
+bool NullRendererScheduler::CanExceedIdleDeadlineIfRequired() const {
+  return false;
+}
+
 void NullRendererScheduler::AddTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
   base::MessageLoop::current()->AddTaskObserver(task_observer);