cc: Pass Occlusion instead of OcclusionTracker to LayerImpls

cc/layers/nine_patch_layer_impl.h

 // Copyright 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 CC_LAYERS_NINE_PATCH_LAYER_IMPL_H_
 #define CC_LAYERS_NINE_PATCH_LAYER_IMPL_H_
 
 #include <string>
 
 #include "cc/base/cc_export.h"
@@ skipping 44 matching lines @@
   // |fill_center| indicates whether to draw the center quad or not.
   void SetLayout(const gfx::Rect& image_aperture,
                  const gfx::Rect& border,
                  bool fill_center);
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       override;
   virtual void PushPropertiesTo(LayerImpl* layer) override;
 
   virtual void AppendQuads(RenderPass* render_pass,
-                           const OcclusionTracker<LayerImpl>& occlusion_tracker,
+                           const Occlusion& occlusion_in_content_space,
                            AppendQuadsData* append_quads_data) override;
 
   virtual base::DictionaryValue* LayerTreeAsJson() const override;
 
  protected:
   NinePatchLayerImpl(LayerTreeImpl* tree_impl, int id);
 
  private:
   virtual const char* LayerTypeAsString() const override;
 
   void CheckGeometryLimitations();
 
   // The transparent center region that shows the parent layer's contents in
   // image space.
   gfx::Rect image_aperture_;
 
   // An inset border that the patches will be mapped to.
   gfx::Rect border_;
 
   bool fill_center_;
 
   DISALLOW_COPY_AND_ASSIGN(NinePatchLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_NINE_PATCH_LAYER_IMPL_H_