cc: Pass Occlusion instead of OcclusionTracker to LayerImpls

cc/layers/painted_scrollbar_layer_impl.h

 // Copyright 2013 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 CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
 #define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/input/scrollbar.h"
 #include "cc/layers/scrollbar_layer_impl_base.h"
@@ skipping 13 matching lines @@
   virtual ~PaintedScrollbarLayerImpl();
 
   // LayerImpl implementation.
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       override;
   virtual void PushPropertiesTo(LayerImpl* layer) override;
 
   virtual bool WillDraw(DrawMode draw_mode,
                         ResourceProvider* resource_provider) override;
   virtual void AppendQuads(RenderPass* render_pass,
-                           const OcclusionTracker<LayerImpl>& occlusion_tracker,
+                           const Occlusion& occlusion_in_content_space,
                            AppendQuadsData* append_quads_data) override;
 
   void SetThumbThickness(int thumb_thickness);
   void SetThumbLength(int thumb_length);
   void SetTrackStart(int track_start);
   void SetTrackLength(int track_length);
 
   void set_track_ui_resource_id(UIResourceId uid) {
     track_ui_resource_id_ = uid;
   }
@@ skipping 28 matching lines @@
   // height (which may differ in the presence of top-controls hiding).
   float vertical_adjust_;
 
   int scroll_layer_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayerImpl);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_