Get rid of virtual Display::CreateScheduler.

cc/surfaces/display_scheduler.h

Index: cc/surfaces/display_scheduler.h
diff --git a/cc/surfaces/display_scheduler.h b/cc/surfaces/display_scheduler.h
index fd868b8d2411bb558dc8d3089d0482a084e5beeb..aa3a90675909840212c497488d78450571b22e69 100644
--- a/cc/surfaces/display_scheduler.h
+++ b/cc/surfaces/display_scheduler.h
@@ -30,12 +30,13 @@ class CC_SURFACES_EXPORT DisplaySchedulerClient {
 
 class CC_SURFACES_EXPORT DisplayScheduler : public BeginFrameObserverBase {
  public:
-  DisplayScheduler(DisplaySchedulerClient* client,
-                   BeginFrameSource* begin_frame_source,
+  DisplayScheduler(BeginFrameSource* begin_frame_source,
                    base::SingleThreadTaskRunner* task_runner,
                    int max_pending_swaps);
   ~DisplayScheduler() override;
 
+  void SetClient(DisplaySchedulerClient* client);
+
   void SetRootSurfaceResourcesLocked(bool locked);
   void ForceImmediateSwapIfPossible();
   virtual void DisplayResized();