Revert of android: Remove custom browser compositor scheduling logic

content/browser/renderer_host/compositor_impl_android.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 CONTENT_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/compiler_specific.h"
@@ skipping 30 matching lines @@
 // -----------------------------------------------------------------------------
 class CONTENT_EXPORT CompositorImpl
     : public Compositor,
       public cc::LayerTreeHostClient,
       public cc::LayerTreeHostSingleThreadClient,
       public ui::UIResourceProvider,
       public ui::WindowAndroidCompositor {
  public:
   class VSyncObserver {
    public:
-    virtual void OnVSync(base::TimeTicks timebase,
-                         base::TimeDelta interval) = 0;
+    virtual void OnUpdateVSyncParameters(base::TimeTicks timebase,
+                                         base::TimeDelta interval) = 0;
   };
 
   CompositorImpl(CompositorClient* client, gfx::NativeWindow root_window);
   ~CompositorImpl() override;
 
   static bool IsInitialized();
 
   static cc::SurfaceManager* GetSurfaceManager();
   static scoped_ptr<cc::SurfaceIdAllocator> CreateSurfaceIdAllocator();
 
   void PopulateGpuCapabilities(gpu::Capabilities gpu_capabilities);
 
   void AddObserver(VSyncObserver* observer);
   void RemoveObserver(VSyncObserver* observer);
-  void OnNeedsBeginFramesChange(bool needs_begin_frames);
 
   // ui::ResourceProvider implementation.
   cc::UIResourceId CreateUIResource(cc::UIResourceClient* client) override;
   void DeleteUIResource(cc::UIResourceId resource_id) override;
   bool SupportsETC1NonPowerOfTwo() const override;
 
  private:
   // Compositor implementation.
   void SetRootLayer(scoped_refptr<cc::Layer> root) override;
   void SetSurface(jobject surface) override;
@@ skipping 22 matching lines @@
   void DidCommit() override;
   void DidCommitAndDrawFrame() override {}
   void DidCompleteSwapBuffers() override;
   void DidCompletePageScaleAnimation() override {}
   void RecordFrameTimingEvents(
       scoped_ptr<cc::FrameTimingTracker::CompositeTimingSet> composite_events,
       scoped_ptr<cc::FrameTimingTracker::MainFrameTimingSet> main_frame_events)
       override {}
 
   // LayerTreeHostSingleThreadClient implementation.
+  void ScheduleComposite() override;
+  void ScheduleAnimation() override;
   void DidPostSwapBuffers() override;
   void DidAbortSwapBuffers() override;
 
   // WindowAndroidCompositor implementation.
   void AttachLayerForReadback(scoped_refptr<cc::Layer> layer) override;
   void RequestCopyOfOutputOnRootLayer(
       scoped_ptr<cc::CopyOutputRequest> request) override;
   void OnVSync(base::TimeTicks frame_time,
                base::TimeDelta vsync_period) override;
   void SetNeedsAnimate() override;
+
   void SetVisible(bool visible);
+
+  enum CompositingTrigger {
+    DO_NOT_COMPOSITE,
+    COMPOSITE_IMMEDIATELY,
+    COMPOSITE_EVENTUALLY,
+  };
+  void PostComposite(CompositingTrigger trigger);
+  void Composite(CompositingTrigger trigger);
   void CreateOutputSurface();
+
+  bool WillCompositeThisFrame() const {
+    return current_composite_task_ &&
+           !current_composite_task_->callback().is_null();
+  }
+  bool DidCompositeThisFrame() const {
+    return current_composite_task_ &&
+           current_composite_task_->callback().is_null();
+  }
+  bool WillComposite() const {
+    return WillCompositeThisFrame() ||
+           composite_on_vsync_trigger_ != DO_NOT_COMPOSITE;
+  }
+  void CancelComposite() {
+    DCHECK(WillComposite());
+    if (WillCompositeThisFrame())
+      current_composite_task_->Cancel();
+    current_composite_task_.reset();
+    composite_on_vsync_trigger_ = DO_NOT_COMPOSITE;
+    will_composite_immediately_ = false;
+  }
   void CreateLayerTreeHost();
 
   void OnGpuChannelEstablished();
   void OnGpuChannelTimeout();
 
   // root_layer_ is the persistent internal root layer, while subroot_layer_
   // is the one attached by the compositor client.
   scoped_refptr<cc::Layer> root_layer_;
   scoped_refptr<cc::Layer> subroot_layer_;
 
   scoped_ptr<cc::LayerTreeHost> host_;
   ui::ResourceManagerImpl resource_manager_;
 
   scoped_ptr<cc::OnscreenDisplayClient> display_client_;
   scoped_ptr<cc::SurfaceIdAllocator> surface_id_allocator_;
 
   gfx::Size size_;
   bool has_transparent_background_;
   float device_scale_factor_;
 
   ANativeWindow* window_;
   int surface_id_;
 
   CompositorClient* client_;
 
   gfx::NativeWindow root_window_;
 
+  // Used locally to track whether a call to LTH::Composite() did result in
+  // a posted SwapBuffers().
+  bool did_post_swapbuffers_;
+
+  // Used locally to inhibit ScheduleComposite() during
+  // UpdateLayerTreeHost().
+  bool ignore_schedule_composite_;
+
+  // Whether we need to composite in general because of any invalidation or
+  // explicit request.
+  bool needs_composite_;
+
   // Whether we need to update animations on the next composite.
   bool needs_animate_;
 
+  // Whether we posted a task and are about to composite.
+  bool will_composite_immediately_;
+
+  // How we should schedule Composite during the next vsync.
+  CompositingTrigger composite_on_vsync_trigger_;
+
+  // The Composite operation scheduled for the current vsync interval.
+  scoped_ptr<base::CancelableClosure> current_composite_task_;
+
   // The number of SwapBuffer calls that have not returned and ACK'd from
   // the GPU thread.
   unsigned int pending_swapbuffers_;
 
   size_t num_successive_context_creation_failures_;
 
+  base::TimeDelta vsync_period_;
+  base::TimeTicks last_vsync_;
+
   base::OneShotTimer establish_gpu_channel_timeout_;
 
   // Whether there is an OutputSurface request pending from the current
   // |host_|. Becomes |true| if RequestNewOutputSurface is called, and |false|
   // if |host_| is deleted or we succeed in creating *and* initializing an
   // OutputSurface (which is essentially the contract with cc).
   bool output_surface_request_pending_;
 
   gpu::Capabilities gpu_capabilities_;
 
-  bool needs_begin_frames_;
   base::ObserverList<VSyncObserver, true> observer_list_;
 
   base::WeakPtrFactory<CompositorImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorImpl);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_