compositor: Add rAF-like functionality for the UI.

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 <string>
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "ui/compositor/animation_frame_task.h"
 #include "ui/compositor/compositor_export.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/layer_animator_collection.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/vector2d.h"
 
 class SkBitmap;
 
 namespace base {
@@ skipping 93 matching lines @@
 };
 
 // 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),
-      NON_EXPORTED_BASE(public LayerAnimatorCollectionDelegate) {
+      NON_EXPORTED_BASE(public AnimationFrameTaskProvider) {
  public:
   Compositor(gfx::AcceleratedWidget widget,
              ui::ContextFactory* context_factory,
              scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   virtual ~Compositor();
 
   ui::ContextFactory* context_factory() { return context_factory_; }
 
   // Schedules a redraw of the layer tree associated with this compositor.
   void ScheduleDraw();
@@ skipping 85 matching lines @@
   virtual void DidCommit() OVERRIDE;
   virtual void DidCommitAndDrawFrame() OVERRIDE;
   virtual void DidCompleteSwapBuffers() OVERRIDE;
 
   // cc::LayerTreeHostSingleThreadClient implementation.
   virtual void ScheduleComposite() OVERRIDE;
   virtual void ScheduleAnimation() OVERRIDE;
   virtual void DidPostSwapBuffers() OVERRIDE;
   virtual void DidAbortSwapBuffers() OVERRIDE;
 
-  // LayerAnimatorCollectionDelegate implementation.
-  virtual void ScheduleAnimationForLayerCollection() OVERRIDE;
+  // AnimationFrameTaskProvider:
+  virtual scoped_ptr<ScopedAnimationFrameTask> RequestAnimationFrameTask(
+      AnimationFrameTask* task) OVERRIDE;
 
   int last_started_frame() { return last_started_frame_; }
   int last_ended_frame() { return last_ended_frame_; }
 
   bool IsLocked() { return compositor_lock_ != NULL; }
 
   const cc::LayerTreeDebugState& GetLayerTreeDebugState() const;
   void SetLayerTreeDebugState(const cc::LayerTreeDebugState& debug_state);
 
   LayerAnimatorCollection* layer_animator_collection() {
     return &layer_animator_collection_;
   }
 
  private:
   friend class base::RefCounted<Compositor>;
   friend class CompositorLock;
 
+  void RemoveAnimationFrameTask(AnimationFrameTask* task);
+
+  std::set<AnimationFrameTask*> rafs_;
+
   // Called by CompositorLock.
   void UnlockCompositor();
 
   // Called to release any pending CompositorLock
   void CancelCompositorLock();
 
   // Notifies the compositor that compositing is complete.
   void NotifyEnd();
 
   gfx::Size size_;
@@ skipping 29 matching lines @@
   bool defer_draw_scheduling_;
 
   // Used to prevent Draw()s while a composite is in progress.
   bool waiting_on_compositing_end_;
   bool draw_on_compositing_end_;
   enum SwapState { SWAP_NONE, SWAP_POSTED, SWAP_COMPLETED };
   SwapState swap_state_;
 
   LayerAnimatorCollection layer_animator_collection_;
 
-  base::WeakPtrFactory<Compositor> schedule_draw_factory_;
+  base::WeakPtrFactory<Compositor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_