Remove SendBeginFramesToChildren plumbing

ui/compositor/compositor.h

 // Copyright (c) 2012 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 UI_COMPOSITOR_COMPOSITOR_H_
 #define UI_COMPOSITOR_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 129 matching lines @@
 
   explicit CompositorLock(Compositor* compositor);
   ~CompositorLock();
 
   void CancelLock();
 
   Compositor* compositor_;
   DISALLOW_COPY_AND_ASSIGN(CompositorLock);
 };
 
-// This class observes BeginFrame notification from LayerTreeHost.
-class COMPOSITOR_EXPORT CompositorBeginFrameObserver {
- public:
-  virtual ~CompositorBeginFrameObserver() {}
-  virtual void OnSendBeginFrame(const cc::BeginFrameArgs& args) = 0;
-};
-
 // Compositor object to take care of GPU painting.
 // A Browser compositor object is responsible for generating the final
 // displayable form of pixels comprising a single widget's contents. It draws an
 // appropriately transformed texture for each transformed view in the widget's
 // view hierarchy.
 class COMPOSITOR_EXPORT Compositor
     : NON_EXPORTED_BASE(public cc::LayerTreeHostClient),
       NON_EXPORTED_BASE(public cc::LayerTreeHostSingleThreadClient) {
  public:
   Compositor(ui::ContextFactory* context_factory,
@@ skipping 89 matching lines @@
   // Compositor does not own observers. It is the responsibility of the
   // observer to remove itself when it is done observing.
   void AddObserver(CompositorObserver* observer);
   void RemoveObserver(CompositorObserver* observer);
   bool HasObserver(const CompositorObserver* observer) const;
 
   void AddAnimationObserver(CompositorAnimationObserver* observer);
   void RemoveAnimationObserver(CompositorAnimationObserver* observer);
   bool HasAnimationObserver(const CompositorAnimationObserver* observer) const;
 
-  void AddBeginFrameObserver(CompositorBeginFrameObserver* observer);
-  void RemoveBeginFrameObserver(CompositorBeginFrameObserver* observer);
-
   // Change the timeout behavior for all future locks that are created. Locks
   // should time out if there is an expectation that the compositor will be
   // responsive.
   void SetLocksWillTimeOut(bool locks_will_time_out) {
     locks_will_time_out_ = locks_will_time_out;
   }
 
   // Creates a compositor lock. Returns NULL if it is not possible to lock at
   // this time (i.e. we're waiting to complete a previous unlock).
   scoped_refptr<CompositorLock> GetCompositorLock();
@@ skipping 22 matching lines @@
                            float page_scale,
                            float top_controls_delta) override {}
   void RequestNewOutputSurface() override;
   void DidInitializeOutputSurface() override;
   void DidFailToInitializeOutputSurface() override;
   void WillCommit() override {}
   void DidCommit() override;
   void DidCommitAndDrawFrame() override;
   void DidCompleteSwapBuffers() override;
   void DidCompletePageScaleAnimation() override {}
-  void SendBeginFramesToChildren(const cc::BeginFrameArgs& args) override;
   void RecordFrameTimingEvents(
       std::unique_ptr<cc::FrameTimingTracker::CompositeTimingSet>
           composite_events,
       std::unique_ptr<cc::FrameTimingTracker::MainFrameTimingSet>
           main_frame_events) override {}
 
   // cc::LayerTreeHostSingleThreadClient implementation.
   void DidPostSwapBuffers() override;
   void DidAbortSwapBuffers() override;
 
@@ skipping 25 matching lines @@
 
   gfx::Size size_;
 
   ui::ContextFactory* context_factory_;
 
   // The root of the Layer tree drawn by this compositor.
   Layer* root_layer_;
 
   base::ObserverList<CompositorObserver, true> observer_list_;
   base::ObserverList<CompositorAnimationObserver> animation_observer_list_;
-  base::ObserverList<CompositorBeginFrameObserver, true>
-      begin_frame_observer_list_;
 
   gfx::AcceleratedWidget widget_;
   bool widget_valid_;
   bool output_surface_requested_;
   std::unique_ptr<cc::SurfaceIdAllocator> surface_id_allocator_;
   scoped_refptr<cc::Layer> root_web_layer_;
   std::unique_ptr<cc::LayerTreeHost> host_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   // The manager of vsync parameters for this compositor.
   scoped_refptr<CompositorVSyncManager> vsync_manager_;
 
   // The device scale factor of the monitor that this compositor is compositing
   // layers on.
   float device_scale_factor_;
 
   int last_started_frame_;
   int last_ended_frame_;
 
   bool locks_will_time_out_;
   CompositorLock* compositor_lock_;
 
   LayerAnimatorCollection layer_animator_collection_;
   scoped_refptr<cc::AnimationTimeline> animation_timeline_;
 
-  // Used to send to any new CompositorBeginFrameObserver immediately.
-  cc::BeginFrameArgs missed_begin_frame_args_;
-
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_