Get rid of virtual Display::CreateScheduler.

cc/surfaces/display_scheduler.h

 // 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.
 
 #ifndef CC_SURFACES_DISPLAY_SCHEDULER_H_
 #define CC_SURFACES_DISPLAY_SCHEDULER_H_
 
 #include <memory>
 
 #include "base/cancelable_callback.h"
@@ skipping 12 matching lines @@
 
 class CC_SURFACES_EXPORT DisplaySchedulerClient {
  public:
   virtual ~DisplaySchedulerClient() {}
 
   virtual bool DrawAndSwap() = 0;
 };
 
 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();
   virtual void SetNewRootSurface(SurfaceId root_surface_id);
   virtual void SurfaceDamaged(SurfaceId surface_id);
 
   virtual void DidSwapBuffers();
   void DidSwapBuffersComplete();
 
   void OutputSurfaceLost();
@@ skipping 41 matching lines @@
 
   base::WeakPtrFactory<DisplayScheduler> weak_ptr_factory_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DisplayScheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_DISPLAY_SCHEDULER_H_