Add DisplayScheduler to enable BeginFrame-based scheduling of surfaces.

content/browser/compositor/onscreen_display_client.h

 // Copyright 2014 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 CONTENT_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_
 #define CONTENT_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_
 
 #include "cc/surfaces/display_client.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "cc/surfaces/display.h"
 
 namespace cc {
 class ContextProvider;
+class DisplayScheduler;
 class SurfaceManager;
 }
 
 namespace content {
 class SurfaceDisplayOutputSurface;
 
 // This class provides a DisplayClient implementation for drawing directly to an
 // onscreen context.
 class OnscreenDisplayClient : cc::DisplayClient {
  public:
   OnscreenDisplayClient(
       scoped_ptr<cc::OutputSurface> output_surface,
       cc::SurfaceManager* manager,
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   ~OnscreenDisplayClient() override;
 
   bool Initialize();
   cc::Display* display() { return display_.get(); }
   void set_surface_output_surface(SurfaceDisplayOutputSurface* surface) {
     surface_display_output_surface_ = surface;
   }
 
   // cc::DisplayClient implementation.
-  void DisplayDamaged() override;
-  void DidSwapBuffers() override;
-  void DidSwapBuffersComplete() override;
   void CommitVSyncParameters(base::TimeTicks timebase,
                              base::TimeDelta interval) override;
   void OutputSurfaceLost() override;
   void SetMemoryPolicy(const cc::ManagedMemoryPolicy& policy) override;
 
  private:
-  void ScheduleDraw();
-  void Draw();
-
   scoped_ptr<cc::OutputSurface> output_surface_;
   scoped_ptr<cc::Display> display_;
+  scoped_ptr<cc::DisplayScheduler> scheduler_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   SurfaceDisplayOutputSurface* surface_display_output_surface_;
-  bool scheduled_draw_;
-  bool output_surface_lost_;
-  // True if a draw should be scheduled, but it's hit the limit on max frames
-  // pending.
-  bool deferred_draw_;
-  int pending_frames_;
-
-  base::WeakPtrFactory<OnscreenDisplayClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OnscreenDisplayClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_