Read compositor VSync information from platform, when possible

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"
@@ skipping 25 matching lines @@
 }
 
 namespace gfx {
 class Rect;
 class Size;
 }
 
 namespace ui {
 
 class Compositor;
+class CompositorVSyncManager;
 class Layer;
 class PostedSwapQueue;
 class Reflector;
 class Texture;
 struct LatencyInfo;
 
 // This class abstracts the creation of the 3D context for the compositor. It is
 // a global object.
 class COMPOSITOR_EXPORT ContextFactory {
  public:
@@ skipping 159 matching lines @@
   // Returns the size of the widget that is being drawn to in pixel coordinates.
   const gfx::Size& size() const { return size_; }
 
   // Sets the background color used for areas that aren't covered by
   // the |root_layer|.
   void SetBackgroundColor(SkColor color);
 
   // Returns the widget for this compositor.
   gfx::AcceleratedWidget widget() const { return widget_; }
 
+  // Returns the vsync manager for this compositor.
+  scoped_refptr<CompositorVSyncManager> vsync_manager() const;
+
   // 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(CompositorObserver* observer);
 
   // 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();
 
   // Internal functions, called back by command-buffer contexts on swap buffer
   // events.
 
   // Signals swap has been posted.
   void OnSwapBuffersPosted();
 
   // Signals swap has completed.
   void OnSwapBuffersComplete();
 
   // Signals swap has aborted (e.g. lost context).
   void OnSwapBuffersAborted();
 
-  void OnUpdateVSyncParameters(base::TimeTicks timebase,
-                               base::TimeDelta interval);
-
   // LayerTreeHostClient implementation.
   virtual void WillBeginMainFrame(int frame_id) OVERRIDE {}
   virtual void DidBeginMainFrame() OVERRIDE {}
   virtual void Animate(double frame_begin_time) OVERRIDE {}
   virtual void Layout() OVERRIDE;
   virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta,
                                    float page_scale) OVERRIDE {}
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(bool fallback)
       OVERRIDE;
   virtual void DidInitializeOutputSurface(bool success) OVERRIDE {}
@@ skipping 35 matching lines @@
 
   // The root of the Layer tree drawn by this compositor.
   Layer* root_layer_;
 
   ObserverList<CompositorObserver> observer_list_;
 
   gfx::AcceleratedWidget widget_;
   scoped_refptr<cc::Layer> root_web_layer_;
   scoped_ptr<cc::LayerTreeHost> host_;
 
+  // The manager of vsync parameters for this compositor.
+  scoped_refptr<CompositorVSyncManager> vsync_manager_;
+
   // Used to verify that we have at most one draw swap in flight.
   scoped_ptr<PostedSwapQueue> posted_swaps_;
 
   // 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_;
 
@@ skipping 11 matching lines @@
   bool draw_on_compositing_end_;
 
   base::WeakPtrFactory<Compositor> schedule_draw_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_